Marty we are using top feed lines and have noticed that 24/7 is too much but worked. Only using 1 inch rockwool for clone starters and then 3 inch netpots with hydrotron. If the water level inside the tubs falls too much the long air time on the exposed roots tend to try them out and turn brown. Other wise we would run a much shorter time. Tuning in.

Marty, do you ever have problems with roots cloging lines ? I ask because we tried to put the drip line in the netpot only to find the roots clogged up the lines and we ended up with bonsai's before we found the problem.