Designing a system is a matter of sorting out the parts you're going to need and finding suitable candidates. I always like to walk through hardware stores and home supply stores that stock all kind of gardening and other plastic containers and things that can be turned to hydroponics use.He's a little float valve I found which I think might come in useful for my passive systems this Summer. I found this little value on ebay
so I bought a couple at $7 each. They are cute little devils, only about four inches and the seem well suited to controlling the nutrient depth in the subordinate growing tubs I envision for one of the variants of the passive systems. I looked at some other float valves too but they were bigger and made for animal feed troughs.
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Please let me know how these small valves finally worked out!
I know what you are tring to build and I think is is the most kiss system after the smart valves for hydroponics.
Thanks for the endorsement Roger -- I hope it works out. Usually something good happens, but not always.
Cheers, Ray
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