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Thread: Poolmath change to recommended Calcium Hardness levels

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    Poolmath change to recommended Calcium Hardness levels

    HI Chaps,

    It's the start of the season here in Australia and i did the full set of tests in order to balance the pool for the coming months. Not looking too bad, except the CH levels. My levels tested at 290 (with the TF100) which, when i Last looked at pool math, was in the goal 250-350 range but when I looked today I saw the the goal range is now 350-450. Pool school still refers to the 250-350 range so I don't know whether pool math has a typo or you guys have changed the goal? If so why? No worries to add a couple of Kilos of Hardness Increaser if necessary.

    I'm also wondering if I should bump up TA? it always seems to come down over time and settles to around 50.

    For reference the full set is :

    CL 11.5
    CC 0
    CYA 70
    Temp:26C
    TA 50
    PH 7.6
    CH 290
    Salt 3750


    Paul
    33000L Concrete Pool, Viron P320 Pump, Viron-PH Auto PH Chlorinator, Viron CL400 cartridge filter, Sunlover solar heating, TF-100 Testkit and Taylor speedstir

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    Texas Splash's Avatar
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    Re: Poolmath change to recommended Calcium Hardness levels

    Hello Paul. The Poomath calculator and Recommended Levels chart were updated about a month ago. Several items were modified to allow for better consistency with pH and CSI adjustments among others. There may be an area or two elsewhere that still need to be corrected to match, but you're good with the calculator and levels chart. Remember, it's always a good idea to look at the CSI reading for your pool on the calculator after you've inserted your latest pH, TA, and CH readings to ensure you're maintaining the best water chemistry for your plaster. If you have any other questions, please let us know. Have a great season.

    - - - Updated - - -

    Oh, and your TA is fine for now. 50 might be good to keep your pH from rising.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Poolmath change to recommended Calcium Hardness levels

    Please link specifically to the area in Pool School that refers to 250-350 ppm for CH for SWG plaster pools. It is still 250-350 for non-SWG plaster pools. I checked both Recommended Levels and PoolMath and they seem correct to me.
    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: Poolmath change to recommended Calcium Hardness levels

    Hi chem geek,


    I actually read it here: Pool School - ABCs of Pool Water Chemistry
    33000L Concrete Pool, Viron P320 Pump, Viron-PH Auto PH Chlorinator, Viron CL400 cartridge filter, Sunlover solar heating, TF-100 Testkit and Taylor speedstir

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    Administrator Leebo's Avatar
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    Re: Poolmath change to recommended Calcium Hardness levels

    Thank you for pointing out that reference. It will be updated to reflect the other changes.

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    Re: Poolmath change to recommended Calcium Hardness levels

    Quote Originally Posted by chem geek View Post
    Please link specifically to the area in Pool School that refers to 250-350 ppm for CH for SWG plaster pools. It is still 250-350 for non-SWG plaster pools.
    Water Balance for SWGs recommends CH 250-350 for plaster.

    CH/vinyl, FC/plaster and pH/plaster are also inconsistent with the Recommended Levels (for SWCGs).
    23,000 gallons IG gunite, pebble (I think)
    Hayward SP2610X15 1.5 HP Pump, Hayward sand filter
    Mineral Springs SWCG (it's actually Hayward/Goldline), Hayward Goldline T-CELL-15
    Polaris pool cleaner (with booster pump)
    TF-100, SpeedStir, K-1766 Taylor Salt Test, Lamotte Borate test strips

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    Administrator Leebo's Avatar
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    Re: Poolmath change to recommended Calcium Hardness levels


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    Re: Poolmath change to recommended Calcium Hardness levels

    Quote Originally Posted by Leebo View Post

    CH/vinyl, FC/plaster and pH/plaster are still inconsistent between the two pages I linked to.
    23,000 gallons IG gunite, pebble (I think)
    Hayward SP2610X15 1.5 HP Pump, Hayward sand filter
    Mineral Springs SWCG (it's actually Hayward/Goldline), Hayward Goldline T-CELL-15
    Polaris pool cleaner (with booster pump)
    TF-100, SpeedStir, K-1766 Taylor Salt Test, Lamotte Borate test strips

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