Str8Dank we have a 14kw, fourteen 27ga strongbox, 150 ga res, 8.5 inch airstones, and we are running 3" drains. The openings in the screen should be 2" x 4". This is the first run with this system and it is an upgrade from the last run where we used 8 kw, 16 5 ga buckets with (2) 1" drains apeice, the 150 ga res and the 8.5 inch airstones. The last run was Afghani with no screens and our girls choked themselves out first by growing roots into the drains which caused us to loose the fattest girl to pythium, and secondly they choked out radially by filling up the buckets entirely which caused us to loose the next fattest girl. So we lost two right away. Our 2 biggest girls yielded .93 and .90 elbows manicured and dried. We used GH Flora Nova, Diamond Nectar,
Great White,
Hygrozyme (we are looking for a cheaper substitute if you are aware of one),
Botanicare CalMag, and sweet last run. We had to switch to a dead res once the pythium set in and ran H2O2. Our average with 2 plants under a light was .67 lb. We were running a 1.5 horse chiller and still got the root rot, they needed a lot more space and bigger drains!