Well I have been researching and reading posts about how to keep the ph stable in my reservoirs. My city tap is about 150 ppms and around 7-7.5 ph. I expermented by mixing up a 5 gal bucket of nutes and adjusting the ph everyday to see if the ph would ever stabilize. I dont use airstones anymore bc I heard with canna nutes not to. everyday the ph would jump up by .3. Then I read a post that said to use ro water. Does RO water keep ph stable? What do you guys do to keep the ph at a stable 5.8?