I've had my in-ground 21,000 gallon pool for a year, but just this season started following the TFP method. I have a SWG and have had trouble keeping the FC levels up. That's hopefully going to get resolved by the pool manufacturer, but he wanted me to get a store test to verify there weren't any issues with Phosphates first, which I knew there weren't.
I expected that the results from the pool store would be pretty close to my test results but I was surprised. My TF-100 results are:
FC - 3.5
TC - 4
pH - 7.5
TA - 100
CH - 100
CYA - 60
Salt - 2800
This is what Leslie's test said on the same day and sampled same time as above test:
FC - 2.19
TC - 2.44
pH - 7.6
TA - 70* (adjusted due to the effect of CYA)
CH - 81
CYA - 90
Salt - 2242
So I kinda figured their results might be off. So I went to another pool store that uses "BioGuard" testing. This water test was taken from the pool maybe a hour after the first
FC - 1.7
TC - 2.1
pH - 7.6
TA - 79
CH - 71
CYA - 82
Salt - 2203
So I'm legitimately confused now. I guess FC is not that far off with the Leslie test and maybe it dropped a bit due to the sun in the time I was out getting the first test. I don't know, still seems like a pretty big delta. The CYA almost made me cry. I try so hard to get that test right. I make my wife come over and give me her opinion. I'm shaking that thing for the thirty seconds...etc etc. Also it seems like I get it to 70 and then 2-3 weeks later I can definitely see the dot at 70. TA seems off but Leslie's says they "adjust" it but they don't list the original. The other one doesn't say adjusted so I dunno what's up. The Salt is possibly the one I'm most disappointed about if it's the K-1766 that's off. I spent an extra $30 on that test and it's off by 600 ppm? Is that right? That takes it well out of the ideal range of salt for my SWG. It also could be the reason I've been fighting to keep my SWG making enough chlorine this whole season.
Thoughts on the discrepancies here? Is this just normal variances and I just need to expect this or something else?
I expected that the results from the pool store would be pretty close to my test results but I was surprised. My TF-100 results are:
FC - 3.5
TC - 4
pH - 7.5
TA - 100
CH - 100
CYA - 60
Salt - 2800
This is what Leslie's test said on the same day and sampled same time as above test:
FC - 2.19
TC - 2.44
pH - 7.6
TA - 70* (adjusted due to the effect of CYA)
CH - 81
CYA - 90
Salt - 2242
So I kinda figured their results might be off. So I went to another pool store that uses "BioGuard" testing. This water test was taken from the pool maybe a hour after the first
FC - 1.7
TC - 2.1
pH - 7.6
TA - 79
CH - 71
CYA - 82
Salt - 2203
So I'm legitimately confused now. I guess FC is not that far off with the Leslie test and maybe it dropped a bit due to the sun in the time I was out getting the first test. I don't know, still seems like a pretty big delta. The CYA almost made me cry. I try so hard to get that test right. I make my wife come over and give me her opinion. I'm shaking that thing for the thirty seconds...etc etc. Also it seems like I get it to 70 and then 2-3 weeks later I can definitely see the dot at 70. TA seems off but Leslie's says they "adjust" it but they don't list the original. The other one doesn't say adjusted so I dunno what's up. The Salt is possibly the one I'm most disappointed about if it's the K-1766 that's off. I spent an extra $30 on that test and it's off by 600 ppm? Is that right? That takes it well out of the ideal range of salt for my SWG. It also could be the reason I've been fighting to keep my SWG making enough chlorine this whole season.
Thoughts on the discrepancies here? Is this just normal variances and I just need to expect this or something else?