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Thread: Nitrates

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    Nitrates

    Just been told that I will have to change my pool water due to high nitrate levels.
    I have an in ground pool, about 40,000 gallons. With a D.E filter. Right now I cannot maintain any sort of of chlorine level, and the Ph is about 7.2 . The water is clear and blue. All the other chemicial levels are within range. I have an in-line chlorinator which I am filling up and leaving on full! In addition, I am putting 3 to 4 lb of powded Cl in every other day. I live in NJ and close it down for the winter, dropping the water level down way below the water return . I don't really want have to pay out for 'clean'water and new chemicials, is there anything I can do?

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    Join Date
    Dec 2010
    Location
    San Diego, CA
    Posts
    1,129

    Re: Nitrates

    What's your CYA level? Can you post a complete set of test results? FC, CC, pH, TA, CH, CYA
    15,600 Gallon, 16' x 32' In-Ground Vinyl Pool
    Pentair VS 3050 pump, Quad DE 60 filter and SunTouch controller
    8 gallon Liquidator, Aquatherm EcoSun Solar Panels, 2 wheel ThePoolCleaner

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Nitrates

    Welcome to TFP!

    The nitrate level has nothing to do with it, but several of your other levels being off could cause problems like this and it might instead be because you have ammonia in the water, which uses up huge amounts of chlorine.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
    May 2010
    Location
    Pennsylvania
    Posts
    7

    Re: Nitrates

    My pool store gave me the same advice once upon a time. I foolishly took their advice and changed out 18,000 gallons of water. It my have lowered my nitrates I have no way of knowing but I continued to have algae problems until I found this web site. My humble advice is to buy a good test kit (TF-100) and read all you can on this site to educate yourself. If you keep the free chlorine level where it needs to be based on your CYA level you will not have algae problems no matter what your nitrate level is! I am in my second year of BBB pool maintenance and couldn't be happier.
    20,000 gallon IG plaster pool
    DE filter
    Raypak 400,000 BTU natural gas heater

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    Re: Nitrates

    Free Cl is 0
    Total Cl is 0
    PH is 7.2
    TA is 80
    CYA is 30
    Ca hardness is 260
    Phosphates 100
    Nitrates using a stick test was reading" pink?" 3 squares from where it should have been
    I have been using the same store for the last 7 years, and their results are normally ok.

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Nitrates

    Your other levels look good, so it is most likely ammonia. You should shock your pool, see the instructions in Pool School, basically add chlorine to bring FC up to shock level, around 2 to 15 in your case, over and over again until you can maintain an FC level overnight.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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