When the EC drops and ph rises then that is a good thing. It means the plants are happy and taking up nutrients. It also tells you can feed them a little more. Just make sure you have plenty of O2 in the resevoir or bubbler. The more O2 the better uptake of nutrients. I change my resevoir every Saturday. The second saturday I do a flush before that res change.

Did you check the flush water for ph and ec? I was wondering how much salts was locked up in the medium.
gronnh20 Reviewed by gronnh20 on . PH too low This morning, i notice that at least two plants had a coloration problem. No green in the center of the new bud. I checked PH, it was 4 ans EC 4 also ! I flushed the containers and i put new nutes. Do you think i should have give them just water with good PH? Or is it good now ? Fhydro Rating: 5