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Stubborn Ph And Alkalinity - New Owner


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Hi. Just joined today, and although I've done my homework on water treatment, I hope it's not unheard of that things don't always play out according to plan. Anyway, my Spa is a 2012 Dimension 1 Arourora. I have had it now for about 3 months. It is situated in a screened in porch enclosed on three sides by the house, and one side by screen. The home where it is located is a weekend home (Hudson Valley, NYS), and which makes it a bit more difficult to stay on top of the water issues. So far, we've had no major water problems such as cloudy water, foam, smell, etc…, but our readings are not what they should be. We are using Chlorine, and maintaining optimum levels has not been a problem. The PH, however, as well as the Alkalinity, are always high, and don't respond at all to PH-down, Alkalinity-down, any of the Spa Down products. We've emptied, refilled and started from scratch, always with the same result. Tried new filters as well. Though the water is from a well, it is treated extensively by an in-home system, and has been analyzed by our dealer as well as others. A high iron content has been flagged in the water, yet the dealer and others see it as something which should be easily treated. Yet the products are not working to bring down alkalinity or PH. Any ideas or suggestions are very much appreciated.

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How high is your total alkalinity and how are you testing it? This is a starting info we need to help solve your problem. I suspect that your TA is very high and high TA will drive pH up as CO2 outgasses from the water from the aeration of the jets.

Posting a full set of test results (FC, CC, pH, TA, CH and CYA) would be very helpful and also how you tested (strips, drop based kit, pool/spa store testing AND also the brand and model of the test kit/strips used if possible).

Bottom line, acid will bring down both pH and TA but it takes much more acid to lower TA than pH and as long as the TA is high the pH will continue to rise again quickly because of the CO2 outgassing from the water. Aeration from the jets increased outgassing.

It's really not a mystery. It's just basic water chemistry.

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