If you go flood and drain the water cycles are 15 minutes start to fill and drain every eight hours. For 20-25 plants a 3x3 foot table 8" sides, made out of wood would suffice. Install thick shower curtain and drain(from basin) in corner of table. Make your legs are high enough to put an 18"(standard) rubbermaid container for a resevoir under it. Lava rock and or clay gravel. Put your high corner up one inch higher than your drain corner and make sure your other two corners are level to each other(to ensure proper drainage). I usually cut open both ends of a dogfood can and attach it in the drain corner with 1/8" clearance from the bottom of the can to the thick plastic shower curtain, with screws and an electric drill(real handy). I wouldn't recommend this to some people but I punch a few small holes on the sides of the can with a knife to speed drainage. This method to keep the lava rock from getting into the drain has never failed. You have to fill this plant pot with lava rock and/or clay gravel. This system is designed for rockwool germination, cloning medium. You will need a pump to put in the rubbermaid, air bubbler, digital timer(for watering), maybe a valve to reduce the water flow from the drain in the event the pump can't pump fast enough(clamp off the drain with a hose and drill holes in it til' it's draining in sync with the pump). After the system is syncronized it is ready for plants. 1/6 recommended fertilizer per gallon, 5.5-6ph, total water change every five days. Top up resevoir daily etc. Atmospheric pressure in op:15psi, 1000watt hps per unit
