Based on the info you have provided so far the most likely scenario is that you have algae growing in your pool consuming your chlorine as fast as you are adding it, and the sun is also consuming it rapidly. To clear algae from your pool we use this process, Pool School - SLAM - Shock Level And Maintain. To perform a SLAM you need an FAS/DPD chlorine test. The best way to get that is to order a TF100 with XL option from TFTestkits.net. I have been buying my test kits there for years.
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