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Thread: Ouestions- CH, Acid,Testing

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    Ouestions- CH, Acid,Testing

    Hello All,

    So I did my tests this morning with the TF-100 and then went to the pool store to get some LC and MA. I brought a sample in for them to test and I noticed they had a new machine, A Lamott Spin or something like that. I was happy to note that my tests and theirs were almost identical (makes me feel like I am doing something correct. I noticed my CH is getting to the low side, should I add or since my pool is new, will it creep up? Also, I noticed the PS tested for Phosphate 764ppb (recommended range 0-500). Do I need to worry about phosphate? I dont see many people talking about it and the PS didn't say anything. Lastly what do people usually pay for MA? Was wondering is the PS is a good deal or not

    Results TF-100 / PS
    FC 6.5 / 6.46
    PH 7.5 / 7.5
    TA 90 / 110
    CH 225 / 225
    CYA 50 / 46
    CC 0 / 0

    The funny thing was he said my FC was way to high and should be 3. I didn't go there

    Thanks!
    Build Date 11/18/15 - 14K IG Gemstone (Pebble) pool, Hayward EcoStar Variable Speed Pump, 425sf SwimClear Cartridge Filter, Polaris 280 Pool Sweep with Booster Pump, Hayward Command 4 control system, GVA-24 Actuator, LED Light, Water Fall

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    Re: Ouestions- CH, Acid,Testing

    The PS results are relatively accurate because the machine is brand new, give it a couple of months and there is a good chance that accuracy will take a dive due to cruddy maintenance. The better question is: You have a TF-100, why are you taking a sample in to the pool store?

    As for phosphates, ignore that. Maintaining a proper FC level makes them mostly irrelevant. Your CH is a touch low for a pebble pool, you want to get that up to over 250 to avoid any problems with it leaching. If your CH rises on its own then it is taking it from your finish, which is not something you want. I will let someone more local talk about MA with you, Ohio prices and California prices are rarely comparable.
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

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    JoyfulNoise's Avatar
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    Re: Ouestions- CH, Acid,Testing

    Whether or not to raise CH depends on your fill source water. What is the pH, TA and CH of your fill water? Depending on your fill water, you may not have to add any CH at all.

    Right now, assuming a 55F water temp (you did not report that value), your CSI would be -0.36. If you did nothing but let your pH rise to 7.8, then your CSI would be -0.08. Neither of those values are particularly corrosive to plaster. Your pH has a much greater impact on plaster damage than anything else. If the pH of 7.5 is just a momentary value because you added acid, then so be it. However, if you are trying to keep your pH that low purposely, then you might want to consider letting it go higher because there is little reason to have it at 7.5 or lower for most pools.
    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: Ouestions- CH, Acid,Testing

    Im confused shouldn't PH be between 75-78?
    Build Date 11/18/15 - 14K IG Gemstone (Pebble) pool, Hayward EcoStar Variable Speed Pump, 425sf SwimClear Cartridge Filter, Polaris 280 Pool Sweep with Booster Pump, Hayward Command 4 control system, GVA-24 Actuator, LED Light, Water Fall

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    JoyfulNoise's Avatar
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    Re: Ouestions- CH, Acid,Testing

    Quote Originally Posted by SanMarzano View Post
    Im confused shouldn't PH be between 75-78?
    I always ask because many people think you have to be lower than 7.5 for all the usual bogus reasons told to them by pool stores and such.

    In the winter, when the water is cold and unused, it is perfectly acceptable to let your pH drift up and hover around 7.8. There's very little risk of scaling especially when CH is as low as yours is. Therefore, you can really save yourself money on acid by not trying to push the pH too low.

    My pH will hang at 7.8 for weeks and not need much adjustment. At that pH, my CSI is fine and there's no reason to add acid. When I do, I don't go lower than 7.6 and then it's weeks again before any adjustment is 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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    Re: Ouestions- CH, Acid,Testing

    From Pool School....
    A PH level of 7.7 and 7.8 is ideal, but really anything between 7.5 and 7.8 is doing fine, while levels between 7.2 and 8.0 are acceptable for swimming.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Ouestions- CH, Acid,Testing

    Thanks everyone


    Build Date 11/18/15 - 14K IG Gemstone (Pebble) pool, Hayward EcoStar Variable Speed Pump, 425sf SwimClear Cartridge Filter, Polaris 280 Pool Sweep with Booster Pump, Hayward Command 4 control system, GVA-24 Actuator, LED Light, Water Fall

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