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Thread: Pool calculator Q

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    Pool calculator Q

    After getting 2 different test results from 2 different pool stores; found this site and ordered the TF-100--should be here pretty quick! Anyway, really appreciate all the advice in this forum-especially the BBB! But I have a question about the pool calculator. My levels (according to the pool store) were right on target..finally after having to drain approx. 29in of water to reduce the salt level and adding acid and CY Test results as of 6/27/10:
    FC: 5
    Salt: 3500
    CH: 280
    CA: 30
    TA: 80
    PH: 7.2

    When I input these numbers into the pool calculator, it shows a CSI as -.55????? Does the calculator automatically take the above numbers and calculate-or do i need to calculate my own CSI?
    25000 plaster diving 20'x 36'; SWG; Agua logic; 1 hp hayward cartridge;1-1.5 booster pump; 3ton natural waterfall; flagstone coping; 2 main drains; P-4timer; classic kreepy krauley

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    Melt In The Sun's Avatar
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    Re: Pool calculator Q

    It calculates it for you. I assume this is a plaster/pebble pool?
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    svenpup's Avatar
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    Re: Pool calculator Q

    If I assume your temp is around 86 I get the same CSI as you.

    Knowing this, you will want to keep your pH higher (7.5-7.8) and your CSI will be fine (0.26 - 0.03).

    This will be no problem, as pH will tend to drift up with an SWCG.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Re: Pool calculator Q

    yes its a plaster pool...forgot to include that in my signature! So, no real worries then? The last chemical added was 1 gal of muriatic this past Saturday night.
    25000 plaster diving 20'x 36'; SWG; Agua logic; 1 hp hayward cartridge;1-1.5 booster pump; 3ton natural waterfall; flagstone coping; 2 main drains; P-4timer; classic kreepy krauley

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    svenpup's Avatar
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    Re: Pool calculator Q

    What was your pH before the muriatic acid and what was your target pH?

    In the future, when you get to pH=7.8 add only enough muriatic acid to get down to 7.5
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Melt In The Sun's Avatar
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    Re: Pool calculator Q

    No real worries; just keep an eye on it. You can get pitting of your plaster if CSI is very low for a looong time, but you're not in danger at -0.55 for a little while.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: Pool calculator Q

    Quote Originally Posted by svenpup
    What was your pH before the muriatic acid and what was your target pH?

    In the future, when you get to pH=7.8 add only enough muriatic acid to get down to 7.5

    The PH was 8.0 and target was ???? (I guess anything between 7.2-7.6). I have scaling--calcium I think and thought that the lower PH would help to get rid of it? Can't wait to get the TF-100 and start testing myself. One pool store said that CH was low and on the same day, the other pool store said it was fine.
    25000 plaster diving 20'x 36'; SWG; Agua logic; 1 hp hayward cartridge;1-1.5 booster pump; 3ton natural waterfall; flagstone coping; 2 main drains; P-4timer; classic kreepy krauley

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    svenpup's Avatar
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    Re: Pool calculator Q

    Quoting from the pool school article on scaling:
    Quote Originally Posted by Pool School
    Calcium scale can be very difficult to remove. Small patches of scale can be removed with a pumice stone. In mild cases, lowering your CSI to about -0.8 and brushing aggressively can sometimes remove scale, particularly when a sequestrant designed for calcium is also used, but this can take weeks and you need to be careful not to lower your PH too far of you can damage copper heat exchange coils. There are no drain acid wash systems, such as Jack's Magic The Copper & Scale Stuff, but the heater (if any) must be bypassed and the process can take weeks. The only reliable solution for removing calcium scaling is a full drain and acid wash.
    I'm not sure if this is what you are trying to do. If not, try to keep your CSI slightly negative (-0.3 to 0).
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Re: Pool calculator Q

    I have stains and scaling. The stains came from the lid of a candle that fell in the pool last winter and stayed for a while without me noticing-it was a white metal lid. We have a tanning ledge which our dd put a chair on and that caused some rust stains. Sooo, I tried the vitamin C tab to make sure that it was a metal and it did not dissolve the stain on the tanning ledge. I had put a trichlor tab in a sock and put it on (what I think) is calcium scaling and thought I saw a difference so, having nothing to do this evening, took the sock with the tab in it and started scrubbing the tanning ledge. Much to my surprise and delight the scaling started coming off. So, I took 2 tube socks and layed 5 tri-chlor tabs in each and layed them on the "calcium stains" on the surface of the shallow end of the pool. I'll leave them there until much later this evening and see if it makes a difference . I also changed my timer for the pump to start at 3am (to get the most out of the SWG in the dark) and leave it on until 1pm. See if these ideas will make a difference!
    25000 plaster diving 20'x 36'; SWG; Agua logic; 1 hp hayward cartridge;1-1.5 booster pump; 3ton natural waterfall; flagstone coping; 2 main drains; P-4timer; classic kreepy krauley

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    Re: Let me ask 2 stupid ?'s Why do I have algae?

    how do you determine your shock level?
    25000 plaster diving 20'x 36'; SWG; Agua logic; 1 hp hayward cartridge;1-1.5 booster pump; 3ton natural waterfall; flagstone coping; 2 main drains; P-4timer; classic kreepy krauley

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    JasonLion's Avatar
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    Re: Pool calculator Q

    Shock level is based on your current CYA level. See the Chlorine / CYA Chart.
    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: Pool calculator Q

    thanks alot! I didn't connect the CYA and the FC chart for algae
    25000 plaster diving 20'x 36'; SWG; Agua logic; 1 hp hayward cartridge;1-1.5 booster pump; 3ton natural waterfall; flagstone coping; 2 main drains; P-4timer; classic kreepy krauley

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