I use wave makers in my Rez for the coco tent and have to ph daily I can get away with once a day but twice it better. I adjust down to 5.8 every night and by the next day it’s around 6.2-6.4 after a few days this settles down and it it only raises up to about 6.0 in 24hr
I ph my organic feed with regular ph down acids nitric acid during veg and phosphoric acid during flower. I don’t think that messes with the organics any
The problem with RO is that it is very hard to measure ph accurately. It takes forever to settle out cause there is nothing in the water for it to read.