Thanks, I do have a service and they come weekly. Maybe I will try to convince her to start using BBB which may cut her cost as well. Forgot about the CYA test limit being 100 max read, good point. I will call the pool builder and get his advice on partial drain.
Would changing to salt be a possible alternative to high CL and high cya? Think I read high CAL negativly impacts the CL generator. Thanks for the advice