Original > Hot Tub Forum
Advice on lowering the PH but not taking down the alkalinity at the same time
bradleyabell:
--- Quote from: The Wizard of Spas on August 30, 2018, 12:48:38 pm ---I have found that the most effective way to reduce pH/Alkalinity is to add the product to the water (irrelevant if it is sodium bisulfate or muriatic acid) and leave the jets OFF. You'll get a greater rate of reduction vs. turning the jets on. To be clear, adding your reducing agent and turning on the jets is totally fine. Just doesn't work as effectively.
If both pH and alk are low, increase the alk first and most times the pH will rise as well. If you just need to increase pH only, you can leave the air portals open, as aeration can increase pH. However, I cannot speak to the effectiveness of this tactic in specifics. I would say that it doesn't really work as good as just adding pH increaser, though.
Lastly, if you use Potassiumperoxy Monopursulfate aka Oxidizing Shock/Spa Shock, that has a pH value of approx. 2.3. Thus, adding that in can give you a reduction in pH as well.
Hope this helps. Good luck moving forward.
--- End quote ---
Totally agree about jets off...My local spa company has me do this: pull around 5 gallons water out of tub into bucket...Pour what you need from your PH/ALK reduction product into bucket and mix well. Then pour water mix into middle of tub and turn off tub completely and let sit for 2 hours, then retest...If more needed, redo.
Jacuzzi Jim:
Or just leave it alone, and not worry about it. Unless it's off the charts a little high PH is not a problem, and will come down on it's own. Specially if you are using chlorine.
wmccall:
--- Quote from: Jacuzzi Jim on August 31, 2018, 09:33:33 am --- Or just leave it alone, and not worry about it. Unless it's off the charts a little high PH is not a problem, and will come down on it's own. Specially if you are using chlorine.
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I subscribe to this ideology. Though I'll admit to just keeping the PH near normal and not worrying about alkalinity. I can tell when my PH is too low easily enough though.
Chas:
I have found (here in SoCal) that they almost always go up and down together. However, if one is high and the other is low, it usually means it's time for a water change. We are in a drought here, so I find all kinds of odd chem issues, and it is getting harder and harder to convince folks to change their water at all, let alone four times per year. But if your water is older than three months, consider it a good USE of water to change it out. Not a waste of water at all!
If your water is less than three (or even less than two) months, then lower pH with some form of acid, and a day or so later, raise the TA with baking soda (sodium bicarbonate).
HTH
wmccall:
--- Quote from: Chas on September 09, 2018, 09:56:14 pm ---I have found (here in SoCal) that they almost always go up and down together. However, if one is high and the other is low, it usually means it's time for a water change. We are in a drought here, so I find all kinds of odd chem issues, and it is getting harder and harder to convince folks to change their water at all, let alone four times per year. But if your water is older than three months, consider it a good USE of water to change it out. Not a waste of water at all!
If your water is less than three (or even less than two) months, then lower pH with some form of acid, and a day or so later, raise the TA with baking soda (sodium bicarbonate).
HTH
--- End quote ---
Chas lives?
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