New pool owner trying to get his head around all the chemistry of pool ownership. What I am finding frustrating is getting different results from different stores. I've been to 4 different stores trying to get consistent results. Here is what I am getting:
TA - 110, 110, 150, 160
CH - 210, 220, 220, 360
CYA - 35, 40, 40, 60
Are the tests just that inaccurate, is there too much 'human error' in them? Or are they just using bad reagents, etc? I don't get it. Obviously a different between 110 and 160 is important for TA, but I don't know who to trust. The difference between CH is probably minor, but the last store said it was way out of wack. And lastly the CYA test is a heck of lot different between 35 and 60!
Is the only solution to get a test kit myself? But I would like to know if I get one of the kits mentioned here will I get accurate results or are all these tests kind of flawed in some way? Why are the pool stores all over the map?