I just had my pool refinished (plaster) a week ago, and have been following the directions provided by the contractor. I've done some reading on this forum and have plans on what I'd like to do longer term, but immediately i'm just following the instructions. I purchased a Taylor test kit, and have been trying to compare the Pool Store values to mine (mostly to assure I"m reading things correctly). For the past two days, I've tested my Free Chlorine and have gotten 25ppm. I have a chlorinator (3"tabs) turned all the way up and have been running the pump 24/7 so this wasn't really a big surprise to me. I figured I'd get the reading confirmed at the pool store, and then crank the setting down as well as set my timer on the pool pump to around 10 hours a day, and then adjust the chlorinator as needed over the next few days.
The trouble is the pool store has given be a reading of 5ppm twice while my test provided the much higher value. I'm concerned that maybe I'm doing something wrong in my tests (though I believe I"ve followed the directions correctly).
Current readings: Pool Store Me
FC- 5ppm 25ppm
CC - 0ppm 1ppm
PH 7.6 7.6
TA - 130ppm 120ppm
Cal H- 200ppm 200ppm
CYA- 40ppm 60ppm
To test the chlorine, I used the 10ml line, counted the number of drops and multiplied by .5ppm to come up with 25ppm (50 drops).
Any ideas what I'm doing wrong or is it common to have such a large swing between the Taylor test, and whatever the pool stores use?