You know when I bought mine I bought like 12 of them before 35 bucks or something. Every time I look at anything that has to do with growing it's expensive as hell, I think that's a relatively new thing. you can use all the stuff that goes with drip irrigation you know the quarter inch lines and little sprinkler heads and stuff but those things have to be cleaned relatively often or replaced relatively often to keep them working. I have done a simple open-ended tube just allowing the water to flow out on top of the pots if you use something like pellets on top it would work just fine.
My first auto water system was a 20 gallon barrel that I had set up high in my grow room to gravity feed down to four plants a little solar activated timer would come on and let it open up and drain down on the plants like every three days, I was doing soil back then. It worked okay well enough to let me go on vacation. I think I made a thread about that around here somewhere but it wasn't really the kind of system that would work for most folks growing in tents.
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