First, a big thanks to all. I bought an AG and couldn't find anyone to put it in. So I did it myself. It was hard but it looks pretty good. Took a month but did it all with the help of TFP. I have used BBB for 3 weeks and water is still clear and wonderful! I will post pictures soon.
Now for my question. CYA was 0 at beginning and bought 4lbs of CYA from pool store. Was supposed to give 25 PPM per 10000 gallons. I have a 15x30 which has about 14000. It should have given me some CYA but my TFP test kit still says 0. I think I read in other posts that CYA under 20 can show up as 0. Is that accurate? Should I take sample to pool store for better testing? Also, I had some CC and so I shocked with 2 gallons of 6% Clorox. Should have put me up to 12-15. It put me up to 20ppm FC . That was Saturday. On Sunday had no CC but still had FC of 15. As of today had 5ppm FC and no CC. So that seems good. I am suprised FC stays so high if CYA was zero. I assume I should get more CYA. Pool will stay open til end of September in SE Virginia. Any suggestion on CYA and causes of high FC? Thanks in advance.
CA 50 (vinyl liner)
CYA 0 ?