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Thread: Am I doing this right?

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    Am I doing this right?

    OK so yesterday we actually swam in the pool! Yay! After 18 days of shocking and a few days to let the FC settle down, and it was actually warm enough - ahhh, felt good.

    So, I want to get everything just right. I measured TA at 70, so I added baking soda to bring it up to 90. Today, it was at 90. OK so far. My pH was at 7.2, so I added Borax to bring it up to 7.5. Afterwards, it was right at 7.5, so far so good, right?

    Now I went to adjust my CYA. It was at 40 or so, and I added some CYA (sock through the skimmer) and it took all night & day for it to dissolve completely. Pump ran all night, and I just did a full chemistry check:

    FC: 5+ (just a bit more yellow than 5)
    pH: 6.8 (?!)
    TA: 90
    CYA: 70
    Salt: 2800ppm

    So it looks like I hit all of my targets, but for some reason the pH is down again. Is that the normal reaction when adding CYA? I assume so, since it's acidic.

    I just added more Borax to bring the pH back up. Hopefully I'm doing all of this right...

    Thanks. Just want a sanity check here... I'm still pretty new at this. Last year, I just ran the chlorine generator 4 hours a day and took pool samples to the local shop, did whatever they said...

    6300 gallon Intex above-ground pool
    2650 GPH Intex 100lb sand filter
    CS8110 Salt-water Generator
    Hydro-Tools skimmer (with rusty "stainless" screws)
    Lots of stuff on my site:

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Am I doing this right?

    Any pH in the 7's is okay. I think I would just leave it alone and let it come up (which the SWG will cause it to do.) Everything else is fine.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Am I doing this right?

    Pool Calculator tells me that pH will go down when adding CYA. It's near the bottom: effects of adding chemicals.

    Your CYA should be high enough. Don't add any more.

    The rest of it is easy: keep pH in range, and don't let FC drop below minimum for the CYA level. With a SWG, you'll likely be lowering pH more than raising it. That's it. TA will adjust itself if you keep the pH right all the time. Don't obsess over some target numbers, either. You'll end up on the same roller coaster the pool store had you on.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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