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Thread: Pemixing, storage and use of diluted muriatic acid?

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    Pemixing, storage and use of diluted muriatic acid?

    Most of my pool test readings are very stable and consistent and require little adjustment that's done over long periods. This is likely the case with most pools. I use liquid chlorine almost exclusively with pucks occasionally when the CYA drifts down and needs to be bolstered. It's an old gunite Florida pool with plaster finish and my chlorine use varies from less than 10 oz. per day in the winter to as much as 50 oz. per day in the summer on average. The chlorine use is rather predictable and it's use rather straight-forward.

    The kicker is that my PH tends to drift upwards fairly quickly and needs frequent adjustment to keep PH much below 8.0. I'm using about 4 oz. of muriatic acid a day in the winter and about 8 oz. per day in the summer on average to keep the PH down to about 7.5. I've found that much less acid is required to hold PH at about 8.0 and doing so hasn't caused any problems. One of my complications is that this is a second home, I come-and-go and either a relative or my wife tends to the pool when I'm away.

    Questions:
    1) Should I simply allow the PH to run high, maybe 8.0 to 8.2 to minimize maintenance?
    2) The others who maintain the pool aren't very comfortable with using 11% bleach. I'm wondering if it's worth prediluting some muriatic acid so perhaps one gallon or premix is needed and could be directly added per week. Is anyone else doing something like this and if so what type of containers are being used for the premix?

    Any comments or thoughts would be greatly appreciated.
    Gunite free-form pool in Port Orange Florida with original white plaster lining. Capacity about 12,000 gallons. Pool age about 18 years and fully enclosed by screen room. Using liquid chlorine bleach (10%) dispensed by hand. Taylor K-2006 test kit.

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    Mod Squad mknauss's Avatar
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    Re: Pemixing, storage and use of diluted muriatic acid?

    Do you have a full set of test results? I ask as depending on what your TA is it might be able to be adjusted to reduce your pH rise. Also CH to be sure calcium scaling is not an issue at higher pH.
    If all good, you might consider borates to reduce your pH rise. See Borates - Why and How

    You should keep the pH in the 7's. But no need to go to 7.5 if it may settle a bit higher.

    You can dilute your bleach or acid. I prefer to not dilute my acid as each time you handle it there is a chance of spillage, etc. Just be sure you pour the acid into water. Not the other way around. You need to use original containers for each. Never place chemicals in containers that could be misinterpreted as for human consumption.

    Take care.
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    Kiss4aFrog's Avatar
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    Re: Pemixing, storage and use of diluted muriatic acid?

    I would keep the pH down in the low 7s where is should be rather than let it get up into the 8s, eye irritation, possible damage to equipment ...

    You said "they" weren't comfortable with the 11% bleach, was that supposed to be acid ?? As above, if you want to dilute it, your choice. Just make sure you always add acid to water and label the bottles with the contents and strength.
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    domct203's Avatar
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    Re: Pemixing, storage and use of diluted muriatic acid?

    Any pH between 7.0 - 8.0 is perfectly fine for swimmer comfort.

    pH tends to rise faster from 7-7.6 or so, then the rise will tend to slow down quite noticeable. I would try letting the pH rise to a solid 8, then only push it down to 7.7 or so to see if this helps your situation.
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    Re: Pemixing, storage and use of diluted muriatic acid?

    Sorry everyone, I'm using 31% muriatic acid that I was thinking of diluting because other aren't comfortable with using it full strength. Then again, they're not too keen on the 11% chlorine bleach either!

    Latest numbers:
    FC: 7.3
    PH: 7.6
    TA:100
    CH:280
    CYA:35
    Temp: 70F
    Calculated CSI: 0.03

    I tend to boost the FC to about 8.0 and let it drift down to about 3.0 before adding, especially in the winter, just to avoid frequent adjustments.
    Gunite free-form pool in Port Orange Florida with original white plaster lining. Capacity about 12,000 gallons. Pool age about 18 years and fully enclosed by screen room. Using liquid chlorine bleach (10%) dispensed by hand. Taylor K-2006 test kit.

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