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Small NFT Hydroponics System by Weissensteinburg on May 23, 2009
Table of Contents
Small NFT Hydroponics System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Intro: Small NFT Hydroponics System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Step 1: The Idea . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Step 2: Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Step 3: Build the stands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Step 4: Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Step 5: Holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
Step 6: Assemble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Step 7: Cups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Step 8: Planting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Step 9: Nutrients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Step 10: Maitenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
Step 11: Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Related Instructables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Author:Weissensteinburg I enjoy photography, horticulture and carpentry, and am almost always doing something relating to of those things. Feel free to send me a PM for whatever reason.
Intro: Small NFT Hydroponics System Intro: Hydroponics is a type of agriculture that uses no dirt, and usually results in larger, fuller plants. I recently became interested in the topic, and decided to start my own vegetable garden using the Nutrient Film Technique (NFT). It involves a channel of nutrient enriched water constantly flowing past a plant's roots. The system that I'm demonstrating here is just one example of i nfinitely many possibilities. Take my work and use i t as inspiration for developing a system t hat suits you and your needs.
Step 1:The 1:The Idea Because hydroponics requires a resevoir for water to be drawn from and returned to simultaneously, and I was just building a small system, my design has two gullies. This allows the water to easily go full circle. Along with the water pump, my system uses gravity to assist the flow of water. Each end of the PVC is one inch higher than the end that comes next in the circle. The end of the tube that water enters from is the highest, and the end that it leaves from is the lowest. To achieve this, I built supports out of lumber for the pipes. The supports also keep them high enough to be above the reservoir, so that gravity will r eturn the water to it.
Step 2:Materials 2:Materials 66" of 4" PVC Pipe - If I didn't already have PVC, I would have probably bought plastic gutters. Assorted lumber - Go to t he cull wood section of your hardware store. This is the wood they cut f or other people who didn't want the scraps. I got four 43" 2x4"s, one 1.5x7.5x58" piece, and a scrap of plywood for $3. Screws and such 4 rubber adjustable end caps with hose clamps - about $3 each Submersible pump - I'm using this Teflon tape 16 oz Plastic cups Plants Irrigation tubing Opaque Bucket Plumbing cement Growing medium - I used expanded clay ball Hydroponics Nutrient I would make a list of tools, but there's no way I could make an exhaustive list.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Step 3:Build 3:Build the stands Once you figure out the height of your reservoir, you can start designing your stands. Mine is about 13" tall, so my stands are 13", 14", 15", and 16". Aft er cutting the lengths, I cut a triangle (with a height of 2.5") out of each one to hold the PVC. I'll assume you've already cut the PVC in half. ..it doesn't really deserve it's own step. Next, I attached them together with the 2x4's. I found out the hard way that it's easier to make them level if you attach t he 2x4's mid way up, instead of at the bottom.
Step 4:Plumbing 4:Plumbing You'll need to drill a hole with a spade bit suitable for your tubing in each of the end caps. Drill the holes at the height that you want your water level to be at. I didn't think about it at first, so you'll see in the pictures that they're at the edge, I later had to adjust this, but there's a picture of that, too. Make sure your water level is high enough that the bottom of your cups will be submerged. My pump came with a removable attachment for the tubing, so I wrapped one side of it with Teflon tape and used plumbing cement to attach it to a piece of tubing long enough to reach from the upper tube t o the bottom of the reservoir. I then pushed the tube through an end cap's hole. Push another piece long enough to reach from the lower tube to the reservoir. Then attach two end caps via tubing long enough to fit on both pieces of PVC. When I tested the system like this, it ran surprisingly well, with a just a few small leaks. Use the plumbing cement to seal around the outside of all the tubes. Plumbing cement isn't the most safe substance (toxicity wise), and even though it's probably OK, by just sealing the outside, it at least makes me feel better about. Luckily this stuff cures in two hours, so you can do another test run pretty quickly. A lot of people recommend cleaning everything with a heavily diluted bleach solution to help ward off algae. I did this before I had drilled any holes. It was easy to fill the pipes and then shake them with the end caps on.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Image Notes 1. This can be at the bottom, as water is entering the tube from here. 2. This tube should be at your desired water level.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Image Notes 1. Adjusted to water level.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Step 5:Holes 5:Holes Depending on your plants, the spacing of your holes will be different. I wanted to plant at least six plants, so my spacing worked out to be 8-9 inches between each hole. I would have spread them out farther if I could, but my PVC isn't long enough. We have an adjustable door knob drill bit that drills holes up to 3" wide, so I cut a skewer to 3" and found where on my plastic cups they have that diameter. Hold it up to the PVC and see if it's deep enough. It was. Unfortunately, the only drill we have with a chuck that could fit that bit was a hand drill. At first I tried the "drill a whole every millimeter and cut it out" method...but I didn't have the patience. Instead, I used a 2.5" drill bit and sanded the rest down with my Dremel. If you have to use a Dremel on plastic, make sure to wear a mask in a well ventilated area and clean up all the dust afterward. Rinse the dust off of t he pipes.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Step 6:Assemble 6:Assemble Bring everything out to your final destination and set it up. Because mine is up against the screen of our porch, the lower side faces out, so everyone can get equal amounts of sunlight. Double check that the stands are all in the right orientation...i spent about 20 minutes trying to figure out why the water wouldn't run correctly. I drilled three holes in the lid to my bucket, one for the intake tube, one for the output tube, and one for the power cord. It allows me to leave the lid on, and thus help prevent algae from growing.
Step 7:Cups 7:Cups Drill plenty of holes in the bottom and edges of each plastic cup, f or the roots. Use the cups to measure out clay balls i nto a bucket of water. The water will wash off any dust that has accumulated on them.
Step 8:Planting 8:Planting Carefully use a hose (I like the flat setting) to clean as much dirt as possible off t he roots. Try not to mess them up...they don't like that so much. Once they're clean, surround them in the cups with clay balls. Use enough that they can support themselves and stand tall. When you're arranging the plants in the system, keep in mind what kind of plant they are. Put taller plants in the back, so they don't block the sun. My plants that grow heavier veggies are on the lower section, so t hat I can build a table from the plywood and 2x4's to support their crops.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Step 9:Nutrients 9:Nutrients Mix according to the label. Mine required 20mL per 4L. Because I don't have any way of measuring mL, I converted it to about 4 tsp per 4L and mixed it in a 2L soda bottle. That was a pain. Next time I make it to the hydroponics store, I'm definitely buying a syringe. Nutrient solutions come in all sorts of varieties. I bought a general purpose "grow" solution that also has a "bloom" counterpart for when the plant begins to...bloom.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Step 10:Maitenance 10:Maitenance The nutrients have to be changed periodically, and it's hard to tell when it needs to be done. People do it anywhere fr om once a week to once a month, and it depends on how much you mix at a time. Hydroponics.net recommends that you add fresh water as it's used by plants, because even though water is absorbed, nutrients still remain, and can get more concentrated. They said that once you've added half the amount that was originally in there, it's t ime to change. So with my 7L, once i've had to add 3.5L of additional fresh water, the nutrients will be mostly depleted. Some people also monitor their ph levels. Pool stores generally will check it for free. I don't have a lot of information on the subject to offer, however. Other than that, there isn't a lot that you have to do except care for the plants as you usually would.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Step 11:Resources 11:Resources Instructables has a lot of great information on hydroponics hydroponics.net has a good FAQ SimplyHydro.com has a good explanation of some types of hydroponics I hope this helps with designing your own system. Feel free to leave questions, comments, and most importantly, advice, below. Thanks!
Image Notes 1. Red bell pepper 2. Beefsteak tomato 3. Patio tomato 4. Zucchini 5. Eggplant 6. Cucumber
Related Instructables
My Indoor DWC Hydroponics System by LancePenney
Hydroponic Drip Garden for Vegetables, Herbs or Flowers by dirty_valentine
Understanding Hydroponics by dutchypoodle
My Indoor NFT Hydroponics System (Photos) by LancePenney
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Building your own earth-filled box by xmascarol
Almost Free DIY Simple Hydroponics by Mr E Man
Comments 50 comments Add Comment
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bountycrops says:
Aug 5, 2010. 9:46 PM REPLY Thanks for sharing this wonderful step-by-step process on building an NFT system. The PVC pipe would really do better with this kind of system although rain gutters would also do fine. I think the only challenge with rain gutters is to find a covering that will be light proof. Anyway, what kinds of plant have you tried growing with this system? Would be happy to know the results.
pyrofyr says:
Apr 11, 2010. 1:05 AM REPLY I see most other instructables use LECA on the bottom (Holy christmas batman, I just found out my home depot carries it, and it's cheap too), Vermiculite, and Perlite. I can't find Vermiculite anywhere, and then Inoticed you didn't list what you use besides LECA, did you use anything or just f ill it up with LECA?
Weissensteinburg says:
Jul 27, 2010. 9:11 AM REPLY Sorry for the late reply. I've made two hydroponic systems now, and both used only LECA. Some people seem to like mixes, but I haven't had any robl ro blem ems s usi usin n on onll it it..
tea-pain says:
Apr 16, 2010. 8:06 AM REPLY
is pvc ok to use? its not toxic @ all?
Weissensteinburg says:
Apr 18, 2010. 4:03 PM REPLY
PVC is only toxic when heated.
[AV3NG3R] says:
Feb 3, 2010. 3:48 AM REPLY
LOL, I saw the NFT Acronym and assumed it was your secret code for "No F*cking Time"... Awesome instructable though.
mslorraine101 says:
Oct 14, 2009. 8:08 AM REPLY
How did you get the stinking plastic out of the hole cutter? I'mabout to pull my hair out.
mslorraine101 says:
Oct 14, 2009. 10:21 AM REPLY
I got it. I waited to long to take it out. I had to put iton a stove burner to get it out.
chimpycheeseman says:
Aug 31, 2009. 4:27 PM REPLY just curious as to how much water you want moving across everything. like if i wanted to expand this to something bigger, could i still use that same size pump you are using, or would i want a bigger one
Weissensteinburg says:
Aug 31, 2009. 4:30 PM REPLY You should be able to use the same one. The flow of water r eally isn't as important as the f act that it is cir culating. The reason you can't just stick a plant in the water is that the water needs to re-oxygenate, like in a fish tank.
lchhour says:
Aug 21, 2009. 8:42 PM REPLY where do you purchase adjustable rubber end caps? i'm working on a hydroponics setup and i also have gutters. What can i use for the ends of those? any info/help would be greatly appreciated! thanks!
Weissensteinburg says:
Aug 21, 2009. 8:52 PM REPLY I got those at home depot. Rain gutters are a good idea, I would have gone with them if I didn't already have the PVC. I believe they make end caps for gutters. Have you looked around your store?
serpensphile says:
Aug 6, 2009. 10:24 AM REPLY
Where did you get your nutrients for $9.99??? That's a good price!
Weissensteinburg says: Sunshine hydroponics.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Aug 6, 2009. 12:31 PM REPLY
serpensphile says:
Aug 7, 2009. 4:21 AM REPLY
Thanks!
pipster562 says:
Jun 23, 2009. 12:39 AM REPLY
i was wondering does the pump always have to be on or do you have it on a timer?
Weissensteinburg says:
Jun 24, 2009. 12:03 PM REPLY With a system like this, you'll usually want it on all the time so that the roots don't dry. If you use an aeroponics or ebb and flow system, then you will need a timer.
Parabri says:
Jun 20, 2009. 6:02 AM REPLY
Nice simple , well done Lawn looks good to ,Lol
Ha4xor4life says:
Jun 19, 2009. 7:24 PM REPLY
i have a 60gph pump is that too little?
Weissensteinburg says:
Jun 19, 2009. 7:31 PM REPLY
No, it shouldn't be.
DebH57 says:
Jun 11, 2009. 10:18 AM REPLY Thanks for directing me here Weissenstienberg, I am going to need to spend some time going over this and gathering materials and wil l probably have a lot of questions later.
shwa says:
Jun 4, 2009. 8:12 AM REPLY For the veggies you trying to grow be sure to have really sturdy t rellis on top of your system,tomatoes have very brittle stem which break very easily,I'm not sure about other ones, but you need to have something that can bear the load of the plants and the crop.Or you might try leafy stuff l ike Swiss chard or lettuces and herbs,for half perpetual crop harvest just pick the mature leafs and l eave rest to grow ,but on other thought maybe it's not good idea since you using non organic fertilizer,all nutrients go directly into leafs,you might consider switching t o organic nutrient juice or to aquaponics (a way to go system). keep us informed .good luck
awang8 says:
Jun 6, 2009. 4:04 AM REPLY Organic and non-organic fertilizers are pretty much the same. They are all based on the nutrients a plant requires, and the term "organic" refers to t he fact that the fertilizer has had it's nutrients extracted from organic matter. As for the nutrients itself, it cannot make a difference. There is no such thing as "organic nitrogen" or "organic potassium". I don't mean to offend you, I just want to give you my opinion for "organic f ertilizers".
shwa says:
Jun 6, 2009. 7:15 AM REPLY Problem is not in nitrogen ,potassium or phosphorus.Problem is in other minor element traces such as arsenic, cadmium, and uranium which can be build up in prolonged application of chemical fertil izers,surely FDA approved.This is more evident in soil agri culture than in environment controlled hydroponic system but still sooner or later you'll have to waste the nutrients from your system somewhere...
Weissensteinburg says:
Jun 6, 2009. 5:50 AM REPLY
Not at all! That was actually a point that had been confusing me since I was at the store.
Weissensteinburg says:
Jun 4, 2009. 8:18 AM REPLY Thanks. Will the non organic ferti lizer make a difference in plants t hat aren't as water based as lettuce? I was planning to play it by ear in terms of support. The cukes and eggplants will both need a structure. I've since moved them to the far right of the system, so I can build straight out. As for the tomatoes, I still have the green garden mesh I used in my water bottle raft, so I'll probably use that.
shwa says:
Jun 5, 2009. 10:18 PM REPLY I'm not quiet sure what you mean by non water based plants non of above mentioned plants are water based,what I meant is that plants like tomatoes and alike have roots ,stem and leaves to process nutrients before they reach the the fruit so it's fairly safe to eat them ,leafy veggies everything goes and builds in the leafs so what you give to the plants end up in your stomach bottom line is if you going trough all the pain of making costly hydroponic system why ending up with the products that you can get in any supermarket =commercial chemical based... god know what..poisoned products opposed to natural organic products that are safe to eat .. just by switching couple a things...Like ErisKSC mentioned . Do you keep your pump 24/7 on or it 's interval based?
Weissensteinburg says:
Jun 6, 2009. 5:53 AM REPLY I don't know why I said water based, but I meant how lettuce i s composed nearly entirely of water...which is why people don't generally spring for it as their daily veggies. I keep my pump on 24/7. I'll have to post pictures soon, they've had some amazing growth.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
hjenkins says:
Jun 2, 2009. 12:44 PM REPLY I've done hydroponic tomatos a few times with a complete outfit I bought. The tomato plants grew about 10 lbs of roots each, pretty much took over the growing tank. Tomatos didn't have any taste though. I was using micronutrients along with the regular liquid plant food. It was in a greenhouse, maybe it needed real sun. A neighbor has 3 huge greenhouses for gr owing tomatos commercially and his tomatos are completely tasteless t oo. Now I'm trying upside down tomatos outside. I'll keep trying.
Dr. D says:
Jun 3, 2009. 3:17 PM REPLY It may be the plants you started with. Find some nice heirloom tomatoes. You may have gotten some GMO hybrid bred to look nice and ship well at the ex ens ense e of of taste taste..
awang8 says:
Jun 4, 2009. 11:16 PM REPLY True. Once I tried growing seeds fr om a store-bought hybrid and it t asted like cardboard. Even worse than the tomato i t came from.
grullord says:
Jun 4, 2009. 2:19 PM REPLY
where did you buy the cns 17 for that price?? I can't find it cheaper that 18.00???? PS > By the way great Job!!! Grullord
Weissensteinburg says:
Jun 4, 2009. 8:25 PM REPLY
$9.95 at Sunshine Hydroponics. Hydroponics.
awang8 says:
Jun 4, 2009. 3:35 AM REPLY I've got a 500GPH Bilge Pump somewhere in the garage. Will it work? Or will it be too vigorous and damage the roots? I'm trying to make a nice 4-hole herb garden for my kitchen with all the needed herbs - rosemary, parsley, basil and thyme.
Weissensteinburg says:
Jun 4, 2009. 7:14 AM REPLY
I'm thinking that's a lot more than you need.
awang8 says:
Jun 4, 2009. 3:41 AM REPLY Sorry, one more question I forgot to mention. Are you sure that tiny hydroponics... thing... will be able to handle a mature tomato? Because i'm also lannin lan nin on row rowin in a few of tho those. se.
Weissensteinburg says:
Jun 4, 2009. 7:16 AM REPLY In what sense? Depending on the plant, you may need a trellis to support it. If you mean the nutrient supply, t han yes, it will. As long as water flows, it can get as much nutrient as it needs. That being said, some plants require more nutrients than others, and you'll have to r eplenish the supply more often.
awang8 says:
Jun 4, 2009. 3:45 AM REPLY Gah... I hate it whem you just suddenly have a question pop up in your mind and just have to find out the answer. Can the roots breathe? Water doesn't loook like it has much air in it. Before I make another post, can seaweed solution (liquid fertilizer) be used instead of the hydroponics nutrients?
Weissensteinburg says:
Jun 4, 2009. 7:17 AM REPLY I've seen it's use mentioned, and don't think people generally recommend it over conventional nutrient solution, but I think it will work. Don't take my word for it, though.
awang8 says:
Jun 4, 2009. 11:15 PM REPLY
Thanks alot. 1. I think the pump would still be good enough, http://Hydroponics.net sells 550GPH... So I'm guessing it isn't that bad. 2.Yep. I mean the nutrient supply. 3.Err... Uhh... Umm... I'll buy hydroponic nutrient some online. I'll be buying a few bags of pelite and vermiculite. I beleive t hat mixed in a ratio of 3:1 would make a good growing medium.
RoBear613 says:
Jun 21, 2009. 12:17 PM REPLY A 500GPH pump will push almost 9 gallons of water per minute over the roots. You'll probably flood the tubes and the roots won't get the air they need. For a small system you should probably use a smaller pump. Hydroponics.net also supplies the professionals who would need a big pump. Your bilge pump (if it has a float) might be good for the food and drain method.
http://www.instructables.com/id/Small-NFT-Hydroponics-System/
Toastalicious says:
Feb 2, 2010. 7:57 PM REPLY
What if we use the bilge pump with a flow regulator, or what if i use it for a drip system?
awang8 says:
Jun 29, 2009. 3:53 PM REPLY Since I'm not very... interested... in ebb and flow, and I don't want to buy a new pump, , I thought of an idea. At the hardware store there are chrome switches (designed for toilet cisterns) that can regulate the flow pretty damn good, down to a tiny trickle, and everything inbetween. So I might somehow attach a copper pipe to my pump, then use a olive threaded thingy to connect it to the cistern switch, then use another olive thingy and copper pipe to connect to the gutter (I'm using gutters, it's cheaper). there will be a hole at the top of t he opposite end of the gutter where the water will come out and fall into a bucket containing the pump. The copper pipe, it's lurking in my garage: $0. 2 olive thingies: $4. Switch (or is it called valve?): $3. Seven dollars is cheaper than a new pump. Sorry about the long comment, but I just had to explain everything in detail.
Teleran says:
Jun 1, 2009. 5:45 PM REPLY Another way to control Algae , or even Mold is to use 35% Food Grade Hydrogen Peroxide, and you add it t o the Water at a rate of 7 Drops per gallon. This in effec effectt Sterii Steriizes zes the Wate Water, r, witho without ut sto sto in Nia ara fall falls. s. :) :) Teler Teleran an
Weissensteinburg says:
Jun 1, 2009. 5:52 PM REPLY
Where do you get that/how much does it cost? At school we use 30%, and it costs $25 a bottle.
Teleran says:
Jun 1, 2009. 6:18 PM REPLY I live in Canada. I j ust typed Food grade Hydrogen Peroxide into a Search engine, and it was $13.00 about for 200 ml. Hydrogen Peroxide comes in different grades. Some have stabilizers in it, Chemicals that are poisons. Food Grade does not have Chemical St abilizers in it. It is usually 35%. The stuff you buy in a Pharmacy is 3- 4% and has Stabilizers in it.
ErisKSC says:
May 30, 2009. 5:04 PM REPLY Nice setup! Now you just have to replace the store bought nutrient mix wi th a tank full of fish then you can grow organic hydroponic plants (aka aquaponics). I'm working a setup for my yard with a 500L water tank that i will keep jade perch or sleepy cod in, their waste will fertalise the plants so i can get fish and veggies from the one system! I have also run mini 'plant filters' on my 6' cichlid tank where i grew ornamentals. I love thhis instructible coz it's simplke and effective and can be scaled up as much as you need. Top work
mondaymonkey says:
May 30, 2009. 3:39 PM REPLY
I hope this isn't use for the propogation of illlecit plant material.... :P Looks good :)
SinAmos says:
May 24, 2009. 2:04 PM REPLY
I appreciate all that you have done. It looks nice. Eventually, I will give it a go, but for now, the soil is my playground.
Weissensteinburg says:
May 24, 2009. 10:24 PM REPLY I can understand that. I think something like this gives more of a sense of accomplishment, compared to the relaxation that many people get from traditi trad itiona onall ardenin ardenin .
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http://www.instructables.com/id/Small-NFT-Hydroponics-System/