Thanks for the response.

This is indoor pool, small and only 6 feet deep at its deepest. We use liquid CL2 about 12 %. Also to keep PH down we inject acid.

Only other chems we use is Oxy Shock every Sunday and Sodium Bicarbonate when Alk drops below our paramaters. CL2 ppm is around 2.5-3.0 and PH at 7.5. Dilution is the solution is what people are saying, but even backwashing the pool might bring CC down couple notches never enough. So i decided to try shocking the pool in addition to backwashing. No real results with this at all. Heading into shut down in Sept and thinking about sand in the filter, couple three years old and prob time to change. Think this might have something to do with my CC prob.....

Shawn