We just had our pool converted to a SWG at the same time as a new liner. I see the recommended CYA level is 70-80. Contractor installed a Hayward Aqua Rite 900 series which has a recommended CYA of 30-50. I talked to the installer today and mentioned that Trouble Free Pools recommends a higher CYA level. He disagreed and said to follow the manufacturers level especially since we have an auto cover which is closed much of the time. Supposedly not good to have higher FC levels in this scenario. Can anyone provide clarification and guidance on the optimum CYA? Thanks