I was just wanting to do something that wont need a air pump but still stable enough for a good size plant unlike nft Where the holes and cups aren’t really that big or supportive.
Then I saw a octopot and thought why not keep roots in top allow a water pump in bottom with drain for continued flow
Or what about instead I put a toilet water release in bucket with float so when water fills to certain point it drains allows air then refills and dumps continuously
That was my first idea, the pvc just seemed a little easier to do explain then I could just ask about flush valve