Hot Tub Forum
Original => Hot Tub Forum => Topic started by: fishkat on August 21, 2012, 06:14:32 pm
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My pH is good at 7.4 but my alkalinity is reading high at 300-350. Is there any way to bring the alkalinity down without bringing down the pH? Everything I've read states to use pH decreaser to bring down alkalinity, but I don't need to decrease my pH. I've been a spa tub owner for 5 years now and have not experienced this issue prior to now. Any insight would be greatly appeciated.
fishkat
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How old is the water? High alk is not the end of the world, you can decrease it but many times I just leave it alone on my own spa and it's fine till I am ready to drain it. If you water is more than 5/6 months old it may be ready for a change??
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If your pH doesn't tend to rise, then don't worry about it unless your Calcium Hardness (CH) is higher (say, 100 ppm or more). You may be using a net acidic sanitizier (Dichlor granular/powder or bromine tabs) or oxidizer (MPS) that's helping to balance the pH.
If you do want to lower the TA, then that is done through a combination of acid addition WITH AERATION of the water, which is pretty easy to do in a spa with jets. The procedure is detailed in this post (http://x.havuz.org/viewtopic.php?f=16&t=390).