New pool store opened up advertising their brand-new-state-of-the-art WaterLink DataMate 10 water analyzer "accurate to 1/100th of a part per million".
I like numbers, so I figured why not have them test my water just to see if I'm interpreting my tests correctly. I mean pink or more pink or an in between shade of pink - it's all still very pink.
So I took a sample from below pool surface at dusk last night and let it sit in my kitchen overnight. I tested the water then took the same sample to the pool store. I'm using the Taylor K1005 test.
My FC looks like maybe a 3 or 4. They say 3.13 ppm. So far so good (except I do need to bump up the run time of my swg.)
My TC? Eh. I don't think it got any more pink but maybe. They say 3.38 for a CC of .25
pH - 7.4 vs 7.4 (swg should bring that up closer to 7.6 by the end of the week)
"Hardness". I get CH of 120. The get "hardness" of 169. Idk what they are testing for though really.
TA. Swirling swirling swirling. My green goes to clear at 6 drops, faint purple at 7 drops, and undeniably pink at 8 drops. They say my "alkalinity" is 48.2 ppm.
CYA - I'm out of reagent but it's consistently been 70-80 ppm for me over the past two weeks. They say 106 ppm. [Maybe we should talk about what it means when the black dot disappears.]
Copper I don't test for; they say 0.4ppm
Iron I don't test for; they say 0.1ppm
Salt. My aquacheck sticks are in between 3500 and 3800. They say 4200.
I was in an admittedly bad mood stopping in on my lunch break and running late. The teen girl at the counter said I need to drain half the pool and refill to get my CYA down to 40. I said a CYA of 40 might be the goal for a pool using chlorine tabs but a SWG should be higher. She got kinda snippy with me [my perspective] and said she couldn't advise on any of the other numbers until I got my CYA down to 40 and retested.
TA of 60-70-80? How do you interpret the titration colors?
Am I reading CYA too strictly? I look at the chamber through one eye like using a monocular microscope - focus through left eye but no squinting the right one. I add the solution until I can't see the edges of the black dot in the chamber. I don't go until the chamber looks solid white, but just until I'm not able to distinguish the black dot.
I don't know how they are determining salt. That discrepancy just doesn't make any sense. My numbers match exactly what pool calculator said they should be.