Yesterday I drained 1/4 of the water and refilled, brought CYA from 110ppm down to 70ppm. I can live with CYA at 70ppm. My question is, can I drop to 50ppm CYA with just doing some deep backwashings over the next year? I no longer use pucks and have converted to bleach. I'm aware of my minimum and target FC levels based upon a CYA of 70ppm. I'm really not wanting to do another partial drain and refill, which then entails balancing the TA, pH and CH again. Thank you. By the way this is not a SWG pool, so my ideal CYA range is 30-50ppm.