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I agree with critter on the rectangular pots, i know of two kinds which are 4.5 and 6 liters. For hydro this is more than enough. I myself use ready made slabs without pots, if you can get them in the US?. The slabs are only 7.5 cm in height. Normally I grow my plants only for two days and then flower them for eight weeks. At the end they are 2 feet (60 cm) high. For a hydro system you do need to make a drain.
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