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Thread: Reason to Raise Alkalinity & How?

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    Reason to Raise Alkalinity & How?

    My alkalinity is a little low & the wonderful pool store said I need to raise it. What exactly does it do? How do I raise it?

    pH is around 7.4 & holding steady.
    27ft Above Ground Pool
    Sand filter

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    JasonLion's Avatar
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    You should post a full set of numbers and tell us what kind of pool you have. Alkalinity helps hold your PH stable. You raise it with baking soda. It is quite possible that your current level is fine if you are using bleach for chlorine. You need it higher when using trichlor, which the pool stores tend to assume, as trichlor is constntly lowering the PH.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    I am in a the middle of a 24 hour EMS shift right now. When I get off this evening I will run complete numbers & get them posted.

    I have not been using bleach yet this year. I have been using cal hypo tablets since they are easier for me to handle rather than all the jugs. I am sure I will be switching over soon as I seem to be having trouble finding the cal tablets this year.
    27ft Above Ground Pool
    Sand filter

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    Here are my latest numbers...

    chlorine...3.5 (only did the quick test
    pH...7.3
    Calcium...160
    Alk...50
    phosphates...1500+ (darker than the darkest blue on the comparator)
    CYA...40

    If I am not mistaken, I need baking soda to bring up the alkalinity...How much?

    Any other suggestions? The pool looks good other than quite a bit of stuff settling to the bottom of the pool. It looks almost like dark sand but clouds up when hit with the brush.
    27ft Above Ground Pool
    Sand filter

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    Just a word of caution - if you are testing with strips instead of a drop kit, be very cautious about believing the TA on certain brands of test strips.

    I use test strips on occasion - as a quick check when I've overslept and am hurrying like a mad to get to work, and even sometimes when I become a little lazy and I know my pool is in balance, I'll use strips during the week and drops on the weekend.

    Well, I picked up some AquaCheck strips that always show my TA as almost nil and I basically always have a TA of 100 and I have to work to keep it that low. My fill water has a high TA.

    I have another brand that work just fine, but beware.
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

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    JasonLion's Avatar
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    You can use the pool calculator, see my signature, to figure out how much baking soad you need. You will need to know the volume of your pool. The pool calculator also has a section at the bottom to help you figure that out if you don't know already.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  7. Back To Top    #7

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    Definately NOT using strips...those numbers were from the pool store since it was pouring down rain when I got home yesterday evening. I did run out there & add a little Borax to raise pH a hair.

    This morning using Bens test kit, I got...
    FC...1.5 (need a little chlorine)
    CC...0
    Alk...40
    Calc...130
    CYA...45
    pH...about 7.4 (wish there was a more accurate way to do pH)

    I will check the calculator & get the baking soda in there.
    27ft Above Ground Pool
    Sand filter

  8. Back To Top    #8

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    Oh, good! Just wanted to be sure. I'd just hate to have anyone raise their Alk a whole bunch based on an incorrect reading.
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

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