Hi Baz, Many thanks for your prompt response and advice. This is my first season without having people taking care of the pool for me and hence my next question may misguided, but I have read sooo many articles about pools over the last week that I am more confused than ever: I read that as the Total Alkalinity is so high, that is not possible to take a proper Cholrine reading... therefore I am worried about putting in Choc Chlorine as this is adding more alkaline to the pool?? Thanks in advance for your patience with my silly questions! Paisleyface