I went to the pool store twice to have levels checked against my results on my new test kit (TF-100). The first time I got 50 ppm for CYA level and the pool store got 60 ppm. I shut off our trichlor tab feeder and retested today and got 45ish ppm. Pool store got 70 ppm. I did my test twice and got 45-50ish both times. I'm just wondering if I should trust my number or pool store number more.
The PB told me that even if the tab feeder is "off" it has some flow through it so will add small amount of chlorine and stabilizer. (Same PB also told me there is no stabilizer in trichlor tabs ) I'd like to get the tabs out of the feeder so over time it doesn't get gunked up, but they are so snug in there that there isn't room to pry them up and out. Any ideas?