Thank you for the response. I have a test kit that I use, Not the test strips. I have the trouble free pool test kit. I've been trying to keep it over 10 ppm for shocking so I should up it to 25ppm? As for shock, I just recently switched to the bags of shock because they were out of liquid chlorine. So I'll have to switch back. So I'm better off using the liquid chlorine and not use the tabs at all? Thanks again. They recommended the scale inhibitor because I filled up some of the pool with my well water. They said to next time to use a sock over the hose and it will filter out some of the metals found in it. You said you think its algea. But with the water test, it came up with no black/green/mustard algea. Thanks