New to forum, have been browsing for about a month. I have been working hard on walls this summer Way too much algae. I believe it is because my CYA has increased to 125 from 100. I believe the only way I can lower the CYA is partially drain the pool and add water. I plan on doing this in January when the rain comes to Northern California. I will drain water as the rain starts and hope it rains like cats and dogs Add water from faucet to make up any difference as I can't have the pool pump not running for long. Hopefully this will lower the algae next summer via lowing the CYA. Can the forum please tell me if I'm on the right track? Also, any recommendations as to what granular chlorine to add without increasing CYA? Only other issue is high phosphate and pool store has me purchase expensive phosphate remover