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Thread: How much Sodium Bicarbonate do you put in your pool, month to month?

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    How much Sodium Bicarbonate do you put in your pool, month to month?

    How much Sodium Bicarbonate, Sodium Hydrogen Carbonate, or Alkalinity Up (referring to same thing: Baking Soda) do you put in your pool, month to month, or throughout the year?

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    JoyfulNoise's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Zero.

    Never need it. My fill water has more than enough alkalinity in it.

    Also, pH-Up products are almost exclusively soda ash (washing soda or sodium carbonate). Alkalinity-Up products are baking soda. Typically speaking, alkalinity raising chemicals are unnecessary unless you have acidic fill water (low TA and low pH) and/or you use acidic chlorine sources (trichlor/dichlor).
    Matt
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    Saturn94's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    I only need to add it maybe once a season to bump TA up a little.
    20k IG vinyl liner/Aqua Rite SWCG, T-15 cell/Hayward Pro Grid 6020 DE filter/Polaris 280 w/booster pump/Hayward Superpump 1 hp/city water/Taylor test kits/pool installed March 2004

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    mdogan's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    i never had a chance to use since mostly PH goes up and use MA.
    If you asked question as MA, there could be 100s of reply
    12000 Gallon In ground Pool with Spa Spillway. 32X18 Free Shape Pebble Finish.
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    0, over 200 ta fill water.
    Casey
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Quote Originally Posted by JoyfulNoise View Post
    Zero.

    Never need it. My fill water has more than enough alkalinity in it.

    Also, pH-Up products are almost exclusively soda ash (washing soda or sodium carbonate). Alkalinity-Up products are baking soda. Typically speaking, alkalinity raising chemicals are unnecessary unless you have acidic fill water (low TA and low pH) and/or you use acidic chlorine sources (trichlor/dichlor).
    Yeah, fixed that typo. I realize it depends on fill water mostly. I just was curious as to on average what amounts people here find they use.

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    Mod Squad mknauss's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Do you have a test of your fill water? pH, TA, and CH.

    I assume you have a proper test kit?

    Can you add a signature? See Pool School - Getting Started

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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    If you use trichlor, you will need about 1.14 lb bicarb per lb of tabs to compensate for the TA and pH drop. That's about 0.5 lb per 7 oz tab.

    Other than that, you shouldn't need to add bicarb on a regular basis.
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    JoyfulNoise's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Quote Originally Posted by JamesW View Post
    If you use trichlor, you will need about 1.14 lb bicarb per lb of tabs to compensate for the TA and pH drop. That's about 0.5 lb per 7 oz tab.

    Other than that, you shouldn't need to add bicarb on a regular basis.


    Thanks for the quick rule-of-thumb James!
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Quote Originally Posted by mknauss View Post
    Do you have a test of your fill water? pH, TA, and CH.

    I assume you have a proper test kit?

    Can you add a signature? See Pool School - Getting Started

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    How do you chlorinate your pool?
    Yes, using the Taylor Alkalinity test with a Speedstir. Really the only way to do it accurately.

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    Mod Squad mknauss's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    I was looking for what test kit you use. Not just for alkalinity. A signature would help us help you.

    Take care.
    6000 Gallon IG Fiberglass with integrated Spa;Pentair CCP240 Cartridge Filter with Pentair Intelliflo VS Pump and HTR250 heater. IC40 SWG. EasyTouch 4. Dolphin Active20 Robot "Roadrunner", TF 100 Test Kit w/SpeedStir!
    CLICK HERE to Become a TroubleFreePool.com Supporter!! Pool Math App
    Marty

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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Quote Originally Posted by mknauss View Post
    I was looking for what test kit you use. Not just for alkalinity. A signature would help us help you.

    Take care.
    I use a variety of test kits depending on the situation. Mostly Taylor for accurate tests. My goal is LSI of zero while keeping all parameters within recognized standards.

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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    What chlorine do you use?

    What is your fill water TA?

    What pH are you targeting?

    How much bicarb are you adding per week?
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    Divin Dave's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Since the TA is a buffer to pH, there really wont be an across the board average either on how much to add, how often or whatnot.

    The best TA level is the one which keep your pH stable for the longest period of time. so its going to vary considerably.
    Divin Dave,
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    JoyfulNoise's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    The Huntington Beach Water Quality report from 2017 (see HERE) inidcates a TA of anywhere from 126ppm to 155ppm with a CH value between 50-70ppm (wow, how nice to have such low CH fill water!!). The pH is on the high side at 8.0-8.1. If one were using pH neutral forms of chlorine (chlorinating liquid or an SWG), then no bicarb additions would be necessary and one would likely being using muriatic acid regularly to keep the pH and TA in check. The fill water would already have a CSI value close to zero so not much acid would be needed.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    needsajet's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    For me, it's zero.

    Our fill water has TA of 50, so there's ample incoming TA normally.

    One day in 2016, we got a really big rain (>7") that dropped my TA by 30 ppm and happened to be helpful with high TA at the time. If I had already dropped TA down to 50 or 60, then I might have needed to add some, so I keep three pounds of baking soda in stock (which is still there).

    I could also use that if I ever had a warranty claim / service call and needed to bump my TA up to 80 ppm to be in line with an equipment manual temporarily.
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    Mod Squad woodyp's Avatar
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    Re: How much Sodium Bicarbonate do you put in your pool, month to month?

    Just checked mine on Saturday. TA is 40 and ph is 7.5.........I target a TA of 50 in the summer and haven't added a thing since September. Seems to be my sweet spot for ph. I usually have to add 4 or 5 boxes of baking soda by the time the season rolls around after all the winter rain water and draining down and such.
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