I had my water tested at the pool store (my TF100 is on its way) and my CYA was at 150. I drained about 50-60% of my water and then refilled it over the weekend. It was done refilling Sunday morning and I ran my pump 24/7 to circulate the water. I took a sample to the pool store Monday night and they still tested my CYA at 150! What a downer after all my work draining for the first time. They tested it 2 times with two different types of test and still got 150.
Does it normally take a few days to show a change in CYA? I was hoping for SOME improvement!!