I am presently alternating draining/filling to get my pool to a good cya level. So far this season my readings have continued to be higher than the TF100 test tube reads despite the fact that my pool store says my cya is 50 ppm. Unfortunately i have spent the last few weeks tackling pH and TA issues and now am afraid everything has to start over.
I'm also sure i will lose my 50 ppm Borate level and will have to start that over as well. So now for the questions....
When do i know when to stop draining/refilling? The calculator suggested i drain 60% of my water and i can guestimate that i suppose. From there should i just run the filter for a day or two and then test? Do i need to shock since there is new water? I really hate to have to start putting more acid, bleach, borax in and then find out i need more draining.
Maybe the choice is clear....run everything for a few days and then start testing??