im using aeroponics accross the boards, cloner, veg and two flower res.. I have a 100gpd R/O unit to supply everything. To make the needed 60 gallons total, i must also waste 60 gallons. Thats a total of 120 gallons, lame!!! Considering i have the R/O unit can i recycle the used 60gallons back through the R/O unit to try to get back 30gallons of clean R/O water??? also how often do you think i should change the out the water in the res.? i know that if i flowered the whole table at once i would change my res. out at the beginning of the new cycle. im a doing a perpetual harvest so im unsure when i should change it.