Thank you for the response. I am at odds with the local pool stores and am stubbornly boycotting them. I have made it my mission to let everyone know about the "pool store chemical trap." Anyhow, I have taken my Cya 3 Times and each result has been the same. I took into account my vision and had my wife do it also. They all came out right around 40. I used the bleachcalc to figure how much acid to add in pounds since that was the number I was targeting.

I shocked last night after my post and will see later what reading I get.

Joe