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Thread: Help with new pool and SWG..which chemical do i fix first

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    Help with new pool and SWG..which chemical do i fix first

    First I want to say thank you!! This forum is incredible!! I've had different INTEX pools for years and could have REALLY used this in past years! So, I'm starting from scratch since I now realize how incredibly clueless I am about the water chemistry, and because this is my first year with an SWG. We have a 16' x 48'' INTEX ultra frame pool with the INTEX SWG. We live in the country, and fill our pool with softened well water. Here's my problem...the water (right now) is crystal clear, however, here are the test results from the hth 6 way test kit(with drops, not the strips) and I already have those stupid back swimmer bugs. ( I am sure that's what they are, did some research to make sure)
    Salt- 2550
    Cyanuric acid- 50
    Ph- 7.5
    Chlorine- 0
    Alkalinity - 380
    The pool holds about 5,061 gallons of water, and the SWG manual says the salt should be between 2500 and 3000ppm, optimally 3000ppm.
    So I know salt, chlorine, and hardness need to come up. Alkalinity needs to come down, and I think ph and cyanuric acid are good.

    I know they all affect each other so I'm scared to fix one and make another worse! What do I do first? !

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

    Re: Help with new pool and SWG..which chemical do i fix firs

    Your vinyl pool doesn't care about Calcium hardness. If the water is foamy, you might need to add some. Wait and see.

    pH is fine, but it will rise with the SWG. When you lower it with acid, the alkalinity will slowly come down.

    You do need some chlorine in there, now, before algae can get going. Add bleach - about 1.5 qts of 8.25% Chlorox.

    Raise the salt a little - I'd put in 10 pounds - then fire off the SWG and see what happens.
    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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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Help with new pool and SWG..which chemical do i fix firs

    PH is indeed fine for now.

    Get some chlorine in the pool first. I recommend adding chlorine manually right at the moment. SWGs work better if you get everything balanced first before you start depending on the SWG.

    The next step is to raise the salt level towards the high end of the recommended range. Salt will drift down over the course of the season, so you want to start a little high (but not way high, so careful on how much you add).

    A medium priority item is to raise CYA. I wouldn't start that today, just in case you end up needing to shock the pool. But tomorrow or the next day start raising CYA up to the 70 to 80 range recommended for a SWG pool.

    There is no need to raise calcium hardness in a vinyl liner pool. Especially given your very high TA, you don't want CH much above 50 or you will get calcium scaling in the SWG.

    If that test result is correct, your TA is very high. Lowering TA is going to be a slow process and there is no need to start right away. Simply lowering the PH to 7.2 each time it gets to 7.8 will lower the TA eventually.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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