added baking soda today - will check the numbers tomorrow morning. the liner is 4-5 years old so I don't think that is it. I usually lose 2-3 ppm chlorine a day, even with the cover on. Depends on how sunny it is and how warm the water is- I have the clear bubble wrap type liner. The water is clear and there is never a lot of CC when I check - usually .5. I thought I was consuming a lot of chlorine because of the ph drift or low CYA....or is a that normal? I usually add the chlorine at night when the sun goes down so the chlorine gets to do some work (very light bather load, by the way, just me and a few friends, once or twice a week, not any splash out to speak of) and I check in the morning before I go to work to make sure it's between 3-5, and then I check when I get home at night to see how much to add that night. If it's cool or cloudy I may skip that day - and so far it's never been below 2-3, (Had algae the first summer - I am never fighting that battle again!) Does that seem normal or too much chlorine loss per day?