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Thread: Help with balancing water

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    Help with balancing water

    We had an algae problem a week ago. took a water sample to the local pool store on 6/6 after adding 2 gals of liquid chlorine:
    FC 2; TA 2; CYA 150; TA 120 pH 7.5 phosphates 2000; dissolved solids 3000

    Added 6# of shock over 36 hours. Chlorine not holding. but Algae getting under control with some added brushing.
    Drained a foot of water and added back hose water 3 x over 3 nights.
    Today's water sample results:
    FC .5; TA .5; CH 220; CYA 30; pH 7.4; Phosphates 2500; dissolved solids 1900

    backwashed filter today and ready to add m. acid, wait til sundown and add shock. Pool store recommend Phos Free, but after visiting your site I see it's a money maker for the store.
    Any other recommendations?
    Location: Phx Arizona, 19,000 gals, IG Plaster blt-1999 pump 1.5 hp Nautilus FNS 48 DE filter
    Phx Arizona, 19,000 gals, IG Plaster blt-1999, 1.5 hp pump, Nautilus FNS 48 DE filter

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    Join Date
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    Re: Help with balancing water

    What "Shock" are you adding? Your CYA is already at 150, and adding "shock" is more than likely just increasing your CYA level.

    My recommendation is for you to read Pool School, specifically How to Shock. pool-school/shocking_your_pool

    You are going to need a QUALITY test kit, such as the TF-100 from tftestkits.net to do this. AND, you are almost certainly going to have to drain a very large amount of water and refill. Your CYA needs to be down around 40-50, not at 150+. Shocking at a CYA level that high is going to be a real pain.

    Ignore the phosphates.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    linen's Avatar
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    Re: Help with balancing water

    Welcome to tfp, swinaz

    RobbieH has some great recommendations! Here are mine:

    Quote Originally Posted by swinaz
    Pool store recommend Phos Free, but after visiting your site I see it's a money maker for the store.
    Any other recommendations?
    Take a look at this poolschool article, it details the tfp recommendation on clearing a pool: http://www.troublefreepool.com/pool-...efeating_algae There are a couple of links in there that are very important to read.

    Also, to be most effective you will need to have an appropriate test kit. The fact that the two results for cya you have are so far off, suggest the pool store results you have are not reliable. See this link for details: http://www.troublefreepool.com/pool-...kit_comparison

    Let us know if you have any questions!
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Help with balancing water

    I am going to shock the pool according to your directions and do an OCLT with a Taylor k-2005. Will let you know how that goes.
    Phx Arizona, 19,000 gals, IG Plaster blt-1999, 1.5 hp pump, Nautilus FNS 48 DE filter

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    Mod Squad jblizzle's Avatar
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    Re: Help with balancing water

    Was it a typo that the first test shows CYA of 150ppm and the second one shows CYA of 30ppm. If those are the numbers they gave you, then that just proves how bad pool stores are at reporting CYA as you would have had to replace 80% of your water to get that drop.

    Summary: Get your own good test kit.

    EDIT: The K-2005 does not have the FAS-DPD chlorine test that is required to accurately test your FC and CC. Luckily you can buy just the FAS-DPD test and add it to your K-2005 to have the equivalent of the K-2006 which we recommend.
    Jason, TFP Moderator
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  6. Back To Top    #6

    Re: Help with balancing water

    good to know about the test kit add-on.

    No that wasn't a typo and we DID drain water from the pool for 3 nights in a row, removing and replace about a foot or more of water each time.
    Phx Arizona, 19,000 gals, IG Plaster blt-1999, 1.5 hp pump, Nautilus FNS 48 DE filter

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    Mod Squad jblizzle's Avatar
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    Re: Help with balancing water

    Three 1 foot drains would only lower your CYA level by 80% if your average depth was 2.5 feet.

    Bottom line pool store was off on at least one of those tests. The bad part is you don't know which ... so hard to know what FC level to target.

    Have you tested it for yourself yet?

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Join Date
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    Re: Help with balancing water

    Those test results are nonsense.

    You lost 30% of your TDS, 80% of your CYA and actually gained 25% of your Phosphates - it's just not credible

    The only problem you are having with the chlorine is that you aren't adding enough of it. What you add is instantly used up by the algae in the pool. It's doing it's job - you are seeing improvement in the algae - but it's just not enough.

    It's sounds like you are on the right track. A good test kit (with an FAS-DPD chlorine test - not just the drop kind) will really set you free from the round and round at the pool store.
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

  9. Back To Top    #9

    Re: Help with balancing water

    thanks to all who posted. I added chlorine/bleach tonight. Will get recommended tester asap and kiss the pool store goodbye. I agree, and feel like I'm on the right track; just need to get enough FC.
    Phx Arizona, 19,000 gals, IG Plaster blt-1999, 1.5 hp pump, Nautilus FNS 48 DE filter

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