Hi, we are having severe green pool algae problem with our pool we have 20,000 in-ground pool we have Pentair Clean n Clear Plus 420 sq. ft. Cartridge filter the Cartridge is less than year old and are OEM have tried super chlorination, and Kem-Tek KTK-50-0006 Pool and Spa 60-Percent Concentrated Algaecide, 1 Quart and cleaning the filters but the algae does not go away I will attach water chemistry report we went to our local pool service supply did they ran the sample on the water link spin lab they Recommend 4 gallon HASA SANI-CLOR CHLORINATING LIQUID FOR POOL AND SPA SANITIZATION Swimming Pool Liquids - Sani-Clor / HASAChlor and before we used the chlorine Muriatic Acid Sodium Bicarbonate it's been 18 hours and have not seen any improvement and looking my test kit the total chlorine is only about 3.2 PPM we added the Kem-Tek KTK-50-0006 Pool and Spa 60-Percent Concentrated Algaecide right after the Chlorine and we used are algae brush we do see the PSI coming up on the filters it was Recommended that we adjust the pool skimmer float valve diverter so the main drain can have more suction any help would be greatly appreciated