Yeah, just start testing and treating tomorrow. That is what we did -- I wasn't interested in pulling out our test kit at the time. We subsequently had to increase calcium hardness, total alkalinity, pH, CYA and chlorine. Its hard for me to fathom that he thought everything was OK when he left, considering what it took to bring things to TFP standards >> 29 lbs calcium chloride, 11 lbs baking soda, etc. However, once things got the right levels, its been easy-peasy to maintain with shots of muriatic acid and bleach.