I only started checking my runoff last week. Mine is around 6.2 most of the time. My water is 7.14 out of the faucet and I do not adjust it. I simply add the correct amount of terra vega/flores, cannazym, Rhizotonic, boost and pk 13/14 at the right times. Every now and then I get some stress and adjust accordingly. I will check it every now and then just to see if the ppm's are not to hot. I recently stopped growing in water due to the extreme amount of work involved with keeping the ph and ppm's where they need to be. After 3 grows in water along side of soil, the soil wins.