Hi everyone. I have had my pool for several years now but just bought a new TF-100 test kit. My signature shows the test results. Obviously, the CYA level is way too high. I have been using Trichlor tablets since I installed the pool. What do I do to lower the CYA level? Do I need to partially drain the pool or can I just start using bleach instead of the tablets. Water is clear and do not have an algae problem.