anojones Posted February 7 Report Share Posted February 7 Hello, I've been away for awhile but recently got a new "portable" spa. Holds about 200 gallons of water. I had a question about start up/new fill I couldn't find the answer to. My tap water is a bit acidic but when I start with a new fill the pH goes up to over 8.4 while heating up, I'm assuming do to aeration. It takes about 18 hours to heat the tub (110V) and the jets are on low the whole time raising the pH. I've figured out how much dry acid to use to get the tub in the 7.6 range. I'm wondering if I can add the dry acid when the tub is cold and the water is still acidic so that it will be balance when the tub is hot after the start up process. I'm using the Dichlor/Bleach method for sanitation. What I would like to do is add calcium, baking soda, dry acid and dichlor as soon as the tub is filled so I can use it the next night when its heated up and have the water balanced. Currently I am adding calcium, baking soda and dichlor as soon as the tub is filled cold and then adjust the pH after it is warmed up and the pH has gone up due to aeration. But now I know how much dry acid I need to get it to where it needs to be when the tub water is hot and hoping to add it in when it is cold before it is heated up. Any thoughts? Quote Link to comment Share on other sites More sharing options...
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