What do you mean you cant use your pH meter in distilled water? I thought distilled water was commonly used for pH meters to calibrate them because it has a pH of 7.0?
Senor, after reading a few posts up from JohnnyPotSeed1969 about not being able to use his ph meter with distilled water, I called the manufacturer of my ph tester. They said that it will wreck the probe if you use it with distilled or RO water.
So I have done two things. 1) In one of my buckets, I put a very low level of nutes, to see if the ph buffers in the nutes help to stabilize the ph. 2) In the other bucket, I put distilled water, with H2O2, corrected to 5.6, if it wrecks the probe then it wrecks the probe fuck it.
Let's see which one works.