I have a TF-100 and test my own water. I needed Chlorine so I took a sample with me
to test my CYA. I knew I was going to spend money on Chlorine and skimmer socks.
When I got my test resaults I knew I was going to have to stand tall and be strong!!
Can somebody reasure me that 90 CH is fine for a vinyl pool? If I need to raise it I will but not on their advise!