You know I honestly never have had the problem until this grow and it definitely happened as soon as I switched to bloom nutes.....I kept my plants on grow for the first week of 12/12 at Zandor's and lw's suggestion so I know it wasn't the lighting......definitely the nutes and since the plants have grown like beasts I am starting to see the shift back to the ph rising slowly. I don't think it has anything to do with how old the solution is because it seems to happen even with a fresh res change. I agree with Mr E that small amounts of baking soda seem work better keeping the ph up than the normal ph up seems to.
Weedhound Reviewed by Weedhound on . Drop in pH..but good growth...???? Hi all. I'm about 3 weeks into vegging and my girls look great. Lush and healthy. I've been experiencing slight drops in pH like from 6.0 to 5.7 or 5.7 to 5.5 during the light cycle. I'm not sure what it means or if it's fine or what. TDS at the last rez change (5 days ago) was about 1700 with all nutes and supplements combined. The plants took very well to it. TDS today is 1370 so the plants are using up the nutes. Usually when plants use nutes the pH tends to increase a bit, not Rating: 5