from taylor test kit and yes city water is high in ph just wnder if a inch of water would do this also the free clorine is lower ? could be burn off as we have had many days of HOT SUN but i have added bleach the same way all swim season just i added water last night along with the bleach 2 oz. of polyquat algicide and 1 tab in floater only difference from most all of other test is the water addition ? but i would think city water would not affect fc that bad??????