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Thread: Tannins in Pool Water?

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    Default Tannins in Pool Water?

    Hello! I am from Illinois and recently filled my pool. Right or wrong, I knew that tannins is in the water. But how do I get rid of it? The rest of the water is in pretty good shape (Tested at the pool store), but they were unable to test for tannins. Trying to avoid expensive chemical prices...

    Thanks!

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    Default Re: Tannins in Pool Water

    Upgraded membership; moved thread to chemistry problem section => you may need to log in and log out to gain access!

    To start with, "expensive chemicals" won't help with tannins . . . if that's what it is.

    But you need to be sure. Both tannins and iron (and, more rarely, manganese) can turn water brown. Maintaining high chlorine on sunny days will often remove tannis . . . but that same treatment will make iron stains WORSE.
    • What led you to conclude that the water has tannins? Brown water? Brown stains? Somebody said so?
    • What sort of water are filling with? (Municipal, well, surface)
    • Does that water NORMALLY contain tannins? Will this be a 1x or ongoing problem?

    . . . . more info is needed . . .

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    Default Re: Tannins in Pool Water?

    Thank you for the response, Pooldoc. The entire village supposedly has tannins. But I think it is just iron. Took a sample to the pool store to have it tested. He said that he has treated many pools from that village. Alkilinity is way high (>250). So he gave us a liquid chemical (super potent). Was told to add 32 oz twice a day for 4 days. Then bring another sample in. After running the pump for 24 hours, I checked the filter and it was orange. This is village water, not well. Rest of the tests were fairly close to acceptible ranges.

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    Default Re: Tannins in Pool Water?

    Sounds like iron.

    If you get some of the orange filter waste or goo, put it in a glass with enough water to suspend it, and add either some Vitamin C tabs (ascorbic acid) or some Iron Out. If the water clears . . . it's iron.

    Likewise, if you have an orange spot you can reach, but a few Vit C tabs on it, or a Iron Out paste (in a twist of Saran wrap). Again, if it clears, it's iron.

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    Default Re: Tannins in Pool Water?

    Did as you suggested and it cleared it right up... So with that said, should I keep doing the hydrochloric acid (33%)?

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    Default Re: Tannins in Pool Water?

    OK. So, you've got iron?

    Post full pool and test info (gallons, pool surface, filter type + test results)

    And, if possible, find out WHERE the iron is coming from. One way to check is -- if your toilet fills with the same water as the pool -- is to check the toilet tank. If the interior is dark orangish-brown . . . you have iron in the fill water. (But, if you have a softener or iron removal filter on the house this won't work.)

    Meanwhile, run the filter 24/7, but make sure the return eyeballs are directed so that water flow is NOT directed against a pool surface.

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    Default Re: Tannins in Pool Water?

    Ok, finally got my numbers with me to enter them onto this... I think the Iron content is mostly removed... I did the 5 Gallon Bucket/Poly-fil project to get rid of a lot of it. And not as much is appearing in the pump filter anymore. Below are the updated numbers from two days ago. Water inside the house is taken care of by the culligan system. I am adding 1 quart of Muriatic Acid twice a day currently. Could also use some guidance on Chlorine. Currently using regular clorox bleach.

    Intex 22' x 52" Round Above Ground Pool
    10,000 gallons
    2500 GPH Cartridge Filter

    PH: 8.5
    Alkalinity: >250
    Hardness: 480
    Total Chlorine: 3.2
    Free Chlorine: .3
    CYA: 2

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    Default Re: Tannins in Pool Water?

    "2" is not a possible reading for CYA. Did you mean "20"? What kit are you using? Anyhow, with ZERO algae, your FC should be 5% of your CYA.

    Are you using 31% muriatic from Lowes, etc? If not, you should be. I don't understand how you have pH/TA/CH that high without cloudiness. But if 1 quart at a time is not producing a change, go to 1/2 gallon per dose.

    UNLESS . . . you are using diluted acid. If so, try 1 quart when you get full strength acid. And, READ the "Using Muriatic Acid" page linked in my signature.
    Last edited by PoolDoc; 05-31-2018 at 03:33 PM.

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    Default Re: Tannins in Pool Water?

    I seriously appreciate all of the information. Can we donate to your page somehow?

    The printout I received from the pool store has the CYA at 2. I am using the full stength acid. So I will up it to half gallon doses.

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    Default Re: Tannins in Pool Water?

    Thanks; you can 'subscribe', using the link in the upper right corner of my blue sig. box.

    Currently, subscriptions don't get you much, so it would be a donation.
    Last edited by PoolDoc; 06-11-2018 at 12:03 PM.

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