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Thread: Year 2 Trouble, what do I do with this chemistry???

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    Year 2 Trouble, what do I do with this chemistry???

    I was able to get my 20,000 gal pool clear using the method last year, and it was awesome. This time around I'm pretty sure I messed things up. I had no CYA to begin with so I shocked the pool with sodium dichlor about 10 lbs of it to raise cya. I started the process on 05/29 and the pool is still super murky and my numbers are way off, please help!!
    Ph. ... Less than 7
    TA..... 10 yes ten
    Cya... 100 yes one hundred
    Calcium hardness.... 70
    FC.... 6

    I don't know which I need to fix first to get the water balance right. Pool is definitely still pretty green.
    20,000 IG, chlorine, vinyl liner, Hayward sand filter

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    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Year 2 Trouble, what do I do with this chemistry???

    You've got a few issues to tackle. In order to help you better, please add your location to your profile. Did you just open the pool after having it closed?

    First thing to address is the pH. However, you have a high CYA issue as well. I'd recommend draining close to 50% of your pool volume and refilling. Likely, your fill water has a higher TA than 10 and that will save you some money on chemicals to bring up the TA and pH. Test your water after refilling for CYA, pH and TA and we'll go from there.

    Also, if you're filling with city water, notify your city department that handles water billing and let them know you're adding 10K gallons to your pool. Most cities will waive sewer fees if you state the water is going in the pool... unless you're draining into the city sewer.
    Last edited by JVTrain; 06-02-2015 at 09:04 PM. Reason: Fill water $$$
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Join Date
    Apr 2013
    North OKC Area

    Re: Year 2 Trouble, what do I do with this chemistry???

    What he said, but while filling the pool, you might make the hose squirt a hard jet into the pool so it aerates the water to help bring ph up while filling. It will take longer to fill though.

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

    Re: Year 2 Trouble, what do I do with this chemistry???

    I sure hope you don't live in California, because a partial drain to lose that high CYA is step one.

    And stop with the dichlor! That stuff is really acidic, as you now can see for yourself. It could be etching the metal inside your heater, even. And it adds CYA at an alarming rate as well.

    What test kit are you using? And do you have a lot of FAS-DPD and CYA reagents left? It might be prudent to order some refills now.

    Step One: Partial drain. You have a sand filter, so you almost certainly have a multiport valve, so you have the option of connecting the vacuum and setting the multiport to waste and - clever name, this - vacuum to waste. Any sludge and debris on the floor will be sucked up and shot out the waste pipe and out of your life along with the overloaded CYA water.

    Step two: let the water circulate good after you refill

    Step three: test everything again. Fix pH and TA

    Step four through who knows: raise FC to shock level for your CYA. Brush. Retest, Redose. Repeat. The complete instructions are in the SLAM article.

    Now tell us your pool is worse than this:

    This is the after picture

    There's plenty more in this thread. If they can do it, you can do it.
    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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    Re: Year 2 Trouble, what do I do with this chemistry???

    Thanks so much! I'll post after pics!
    20,000 IG, chlorine, vinyl liner, Hayward sand filter

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