I'm on my second grow w/8 bucket farm and I love it. I don't use extra turn off valves, don't check ph in each bucket. I check ph twice a day from the res's.

After my first grow I changed to 2 new strains (White Russian &
C99/Apollo 11. I also changed the configeration of the system. GH provides 2 res's,a 5 gallon res. controller and a 10 gal. res. I use both, but separated them so one res controls 4 WH and one res. controls 4 C99/A11. I'm at 4th week in flower. Different strains like different nutes. WH likes nutes from 1500 - 1800 ppm, C99/A11 likes nutes 1200 - 1500 ppm.

Results: WOW!!! My best yield yet, and these are from seed (clones are in a different system.) I'll have a huge WH harvest, good C99/A11 harvest.

I change nutes every 6-7 days. I mix 8 gallons for each set up (ppm different). I add nutes to res, let it drain into buckets, after I've completed both set ups, I RAISE THE RES.'S 7 INCHES ONTO A SMALL BENCH I HAMMERED TOGETHER. This causes the remaining nutes to drain into the buckets (res is empty, 2 gallons of nutes per bucket).

To check ph, I place the res on the floor and let nutes run back into res. until nutes are divided into 5 (4 buckets + 1 res.). Now I check PH.

I also measure the original depth of new nutes(@7 inches) with res. on floor, then daily I measure the depth again w/res. on floor. This tells me if I need to add more.

I think this is the best way to use the waterfarm, and you don't waste nutes (unless you don't change nutes often), and it's easy to manage.

End of harvest I take everything apart & clean and sterilize, that's alot of work but well worth it.

I don't know why GH has two res's, but you can use them to your advantage.

Hope this helps.

Peace, PIF