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Hydroponics Float Valve

Hydroponics Float Valve
Do you want to keep your reservoir topped up without hassle?
Don't want to buy an expensive float valve?

Make your own!

I have been building a hydroponics garden, and I wanted to make sure my reservoir doesn't run dry and destroy my pump (or kill my plants), but a side entry float valve would have cost me $30+ at the local hardware store, and I had already spent my budget on pipes and plants.

So, calling on my childhood obsession over MacGyver, I looked for what I had lying around, and built a cheap and surprisingly effective float valve! (effectively for free!)
 
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Step 1Disassemble

Disassemble
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Start with opening up the sprayer.

If you look at the spray end, you should notice it looks like an inverse nut.
Push your pliers into the corners, and turn like a screw, it isn't hard to get undone.

When you have the front off, unscrew the small plastic nut from the other end, and slide out the innards.
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9 comments
Sep 17, 2009. 5:58 PMfearless77 says:
Wouldn't a valve from the toilet system be just as good?
Jun 2, 2009. 8:20 AMelskeetro says:
Killer idea and execution. I just build an auto top off using a toilet ballcock kit. It works well but is very slow to fill. I wish i had found this first. I'm gonna build it any way. Thanks!
May 27, 2009. 2:08 PMjaskohl says:
The purpose of this is a bit confusing to me. Why not just use a larger bucket? I had a similar setup with a 18 gal. Rubbermaid container for the reservoir. I like your solution for the screens. That was the one problem I had was that the roots clogged the hose and flooded the top tube and dried out all the others. Killed the whole crop. Great instructable!
Mar 25, 2009. 9:50 AMchefmichel says:
Excellent idea, good instructable. Nice and clear pictures. McGyver would be proud of you !
Mar 25, 2009. 12:00 PMcrapflinger says:
nifty indeed...i've seen people use toilet parts for this kind of thing...which are easy to acquire
Mar 25, 2009. 12:28 PMTool Using Animal says:
I saw that in your other instructable and didn't "get it", now I do, cool idea.

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Author:NathanWilliams
Software engineer, using electronics and micro controllers as a hobby to keep me sane!