Welcome to TFP! We encourage pool owners to download the PoolMath APP. It is very helpfull in assistting with chemical amounts required. Of course using a proper test kit is extremely important. How are you testing your water? Looks like you have an algae problem. For that we follow the SLAM Process. If your pH test is accurate, 6.8 is much too low. What is your current TA level?
Have you seen our Pool Care Basics? Lots of great articles there to help as well.
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Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!