don't use RO water, pretty much same thing as distilled, no mico-nutrients in it ... keep in mind, just running your airstones, affects pH, as it evaporates acids (alkalis are solid, dont evaporate out) ... as previously stated, the nutes will help balance things out ... but, I ain't no chemist, take my advice with a grain of salt (salt = alkali)
the image reaper Reviewed by the image reaper on . RO H20 + Cal Mag Plus = Unstable pH Hello farmers having some pH problems. Here's the setup... 20 gallon tote with 6 airstones for a bubbling DWC for seedlings. Inside the 20 gallon tote there is currently 15 gallons RO H20 w/ 75 mL of Cal Mag Plus (5 mL per gallon Cal Mag Plus). There is nothing else in this reservoir. Air temps are around 68 degrees farenheit and water temps are between 63 - 68 degrees farenheit. Rating: 5