how do you lower Alkalinity without raising pH in a spa?
i have a hot tub, medium sized i think around 1800 gallons. Chlorine is used to sanitize, and my tub has an ozone-ator if that means anything..
My pH is on the lower side of normal, but my alkalinity is very high– like around 210ppm.
Is there a way to fix this problem?
Two of these answers are great. But John…a Perfectly balanced hot tub will have a pH of 7.4. Not 7. That is considered acidic and below the legal limits allowed (7.2) for a public body of water in the United States.
There is no way to lower just your alkalinity level with out your pH being lowered at the same time. Just leave it as it is if your pH is 7.2-7.5. In time it will come down by itself. It will do no harm to you or your equipment. Do realize to raise your alkalinity the chemical is Sodium Bicarbonate (baking soda). So many companies love to sell you Sodium Hydrogen Carbonate which is another way of saying the same thing. So save your 6 bucks and use your Baking soda. To raise the pH you need sodium carbonate (soda ash). Buy it in bulk if you find you need it. I buy 50# bags for 13 dollars from my pool distributor. No reason to buy United Chemical or for that matter anyone else’s more expensively packaged hot tub balancers. If you use a lot of any of these buy the swimming pool package.
Be sure to also make sure your hardness level is correct 250-400ppm. Otherwise the water will take it from the parts in your tub it can, namely the heating element and seal to your hot tubs pump. Of course it is the same chemical as we use in swimming pools so buy that larger cheaper package. Calcium Chloride.
BTW 1800 gallons is a HUGE TUB. Most are around 380 gallons.
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