how yellow ? pics??after this last heat wave 100+ 4 5 days. some of mine were a little drup-e and yellow.all good now though.
W/ph down, add then stir. wait 5min then test . I like to bring mine down to 6.0 becuse it allways goes up over the course of its use {72hrs for mine}.agin im no guru but ive studdie under 1