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Thread: What is the correct amount of Borax for a SWG 65000 litre pool?

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    What is the correct amount of Borax for a SWG 65000 litre pool?

    Well I am really confused.

    1. Having done the calculations on the pool calculator for a 65000 Litre pool it states I need to add 22.927 grams

    2. using the forum here our calculations to get 12oz to 1000 gallons to get a reading of 10 our calculations was we needed 4.86kg to raise the value to 10. This would then be x by 5 to get a reading of Borax to 50.

    3. Using the recommended value of 30-50ppm (30-50mgs/L) we for 65000 litre pool we worked out we required 3.25kgs for 50ppm or 1.95 kgs for 30ppm.

    Which is the correct amount of Borax for a SWG 65000 litre pool?

    Test today
    PH 7.2
    FC 5
    Total Chlorine 5
    CC 0
    TA 75
    CYA 25

    I realise we need to get the CYA up and will be doing this. However would like to add
    borax as its the beginning of
    The season here in Spain and have lots of guests comming over in the next 10 weeks.

    Many thanks,
    PeggyL
    In ground concrete, tiled pool, 10x5M 1.3 M depth, 65 cubic metres, cristal filter, salt generator, with PH monitor, Spain, Taylor test kit 100

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    UnderWaterVanya's Avatar
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    Re: So you want to add borates to your pool--Why and How

    Try checking the numbers in poolcalculator.com again. My 13500 gallon pool speed 477 oz for 30ppm.

    My pool is at least 1/4 smaller than yours.

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    JasonLion's Avatar
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    Re: What is the correct amount of Borax for a SWG 65000 litr

    You should check your entries in the Pool Calculator. To raise borates by 50 in 65000 liters I get 28660 g of borax and 14246 ml of muriatic acid.
    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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    Re: What is the correct amount of Borax for a SWG 65000 litr

    Hi Jason,

    Thank you for your reply. I think their is a problem with the pool calculator when you use the Metric version. I don't understand the decimal point to get the correct volume. Therefore all the calculations are difficult to interperet. Also we don't have muriatic acid to lower the PH. I will look in the morning and give you the info regarding what we can get here in Spain. I think our PH - is possibly stronger than Muriatic acid?
    In ground concrete, tiled pool, 10x5M 1.3 M depth, 65 cubic metres, cristal filter, salt generator, with PH monitor, Spain, Taylor test kit 100

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    JasonLion's Avatar
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    Re: What is the correct amount of Borax for a SWG 65000 litr

    Don't use PH Minus when adding borates. You only want to use muriatic acid. If that poses a problem, use boric acid instead of borax, which eliminates the need for any acid.

    When using the Pool Calculator, do not use any periods or commas in your numbers, just digits.
    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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    Re: What is the correct amount of Borax for a SWG 65000 litr

    I have been using the app for the calculations (from trouble free pool) It is definately much easier to use the calculator on here.
    In ground concrete, tiled pool, 10x5M 1.3 M depth, 65 cubic metres, cristal filter, salt generator, with PH monitor, Spain, Taylor test kit 100

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    I have black algae in the grouting

    Yesterday the TC was 5 with no cc's but as I had black algae growing in the grouting on the bottom of the pool I added a litre of strong bleach. Swept and cleaned the pool before adding the chlorine.
    Today the pool looks cloudy TC 8.5 CC 0 FC 8.5 CYA 55 PH 7.5 Borate 30 Salt pool. Why is the pool cloudy with no cc?
    In ground concrete, tiled pool, 10x5M 1.3 M depth, 65 cubic metres, cristal filter, salt generator, with PH monitor, Spain, Taylor test kit 100

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    Patrick_B's Avatar
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    Re: What is the correct amount of Borax for a SWG 65000 litr

    Hi Peggy,
    How strong is your bleach, and have you been using something else to gain FC? One liter isn't going to give 8.5 PPM FC even if it were 15%.

    Without knowing more, you may be in the midst of an algae bloom.
    Also, please add your pool data to your signature line. It helps us help you.
    TFP Moderator
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    linen's Avatar
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    Re: What is the correct amount of Borax for a SWG 65000 litr

    Quote Originally Posted by Peggy L
    Why is the pool cloudy with no cc?
    CC>0.5 is a great indicator of problems, but CC<0.5 in not a good indicator of a clean pool. There are many examples of pools with algae and no measurable CC.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: What is the correct amount of Borax for a SWG 65000 litr

    I have looked at the bottle 170 grams per litre of active chlorine. Does that sound right? We have cleaned the pool this morning and the water is cloudy. I need to do some more tests as we used 4 litres of the above in last night.
    In ground concrete, tiled pool, 10x5M 1.3 M depth, 65 cubic metres, cristal filter, salt generator, with PH monitor, Spain, Taylor test kit 100

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    Join Date
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    Re: What is the correct amount of Borax for a SWG 65000 litr

    Depending on the density of the product, that could be around 15% or higher chlorine so sounds about right for chlorinating liquid. It may not last very long (in the bottle) if the temperatures get warm.
    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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