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Thread: Adding Borax.... how long of a wait before swimming?

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    Join Date
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    Adding Borax.... how long of a wait before swimming?

    First off ....great site !!!!

    Im still trying to figure out my pool and chemistry. My Ph is about 6.6 so i have a few boxes im going to add I was just wondering how long before the kids can go swimming in it? Will 4 boxes of 20 mule be enuff to bring up my ph?

    Some numbers..

    Pool is about 18000 gallons

    Cl is about 5.6
    PH 6.6
    Alk 105
    15k Midnight Blue StoneScape Pebble inground pool and spa
    Pentair clean and clear plus 420 filter 2 Sta-rite 1 1/2 hp pump Raypack 406 heater. TF-100 Test Kit

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    Join Date
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    Re: Adding Borax.... how long of a wait before swimming?

    Welcome to TFP!

    If your pool has good circulation, then 30 minutes would be more than adequate to be safe.

    You can use The Pool Calculator to estimate. 4 boxes of 20 Mule Team Borax with your numbers should raise the pH to around 7.1 to 7.2. The "Now" and "Target" pink area for pH does estimate 373 ounces weight (almost 5 boxes) of Borax needed to get to a pH of 7.5 which is a good place to start (a more accurate calculation gives around 5-1/2 boxes). Note that you will have more Borates in your pool and that will increase the amount of acid or base needed to move the pH in the future. With the borax, you'll be adding around 20 ppm Borates to the pool.

    Since you don't want to overshoot, start with the 4 boxes and after a half-hour remeasure the pH. Even at 7.2, that's not bad if the kids want to start swimming right away. The aeration of the water will probably have the pH rise some anyway, especially if you ask your kids to splash around.

    Richard
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Adding Borax.... how long of a wait before swimming?

    Quote Originally Posted by chem geek
    Welcome to TFP!

    If your pool has good circulation, then 30 minutes would be more than adequate to be safe.

    You can use The Pool Calculator to estimate. 4 boxes of 20 Mule Team Borax with your numbers should raise the pH to around 7.1 to 7.2. The "Now" and "Target" pink area for pH does estimate 373 ounces weight (almost 5 boxes) of Borax needed to get to a pH of 7.5 which is a good place to start (a more accurate calculation gives around 5-1/2 boxes). Note that you will have more Borates in your pool and that will increase the amount of acid or base needed to move the pH in the future. With the borax, you'll be adding around 20 ppm Borates to the pool.

    Since you don't want to overshoot, start with the 4 boxes and after a half-hour remeasure the pH. Even at 7.2, that's not bad if the kids want to start swimming right away. The aeration of the water will probably have the pH rise some anyway, especially if you ask your kids to splash around.

    Richard
    Thanks for the info Richard. Will start dropping the borax now....just wanted to make sure I was in the ballpark. Would hate to kill anyone
    15k Midnight Blue StoneScape Pebble inground pool and spa
    Pentair clean and clear plus 420 filter 2 Sta-rite 1 1/2 hp pump Raypack 406 heater. TF-100 Test Kit

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    Re: Adding Borax.... how long of a wait before swimming?

    I didnt want to start another thread but was does SWG mean?? Tried doing a search but nothing came up.
    15k Midnight Blue StoneScape Pebble inground pool and spa
    Pentair clean and clear plus 420 filter 2 Sta-rite 1 1/2 hp pump Raypack 406 heater. TF-100 Test Kit

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    no-mas's Avatar
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    Re: Adding Borax.... how long of a wait before swimming?

    Salt Water (chlorine) Generator
    18k gal inground, everbrite finish, 505 sq ft; 1.5 hp two speed whisperflow; rheem 5100ti 100k btu heat pump; 3 sheer descent falls; DE filter; swg (cell out and using trichlor for now)

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    Re: Adding Borax.... how long of a wait before swimming?

    Well after adding 4 boxes of borax here is my new numbers....

    CL 4.4
    PH 7.9
    Alk 157....ouch??
    15k Midnight Blue StoneScape Pebble inground pool and spa
    Pentair clean and clear plus 420 filter 2 Sta-rite 1 1/2 hp pump Raypack 406 heater. TF-100 Test Kit

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    Butterfly's Avatar
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    Re: Adding Borax.... how long of a wait before swimming?

    Well, okay, did the kids go in and if "yes", how much splashing did they do?!

    What is the weight/ounces in your box of 20 Mule Team Borax?

    Do you have some Muriatic Acid on hand?

    What is your CYA level?

    We'll help you get your pool balanced soon!

    Welcome to the forum
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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