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Thread: high CH

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    high CH

    I received my tf-100 test kit. high CYA and CH. CYA matched pool store. CH at store has always been 250 for last 5 years. I tested for the last 3 days and has always tested at ~ 500. Hard to believe the ppm is that much of a difference. Also am curious why the store has consistently gave me a reading of 250 ppm. Any thoughts? thanks.
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

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    Mod Squad kimkats's Avatar
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    Re: high CH

    Their test did not go high enough? They did not know how to do the test? Who knows. I am VERY surprised the CYA was even close. Did they at least tell you it was high and how to "fix" it?

    You have found out why we like to test our own water. Good job!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Mod Squad zea3's Avatar
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    Re: high CH

    Its highly unlikely that your CH has not budged in 5 years. Do they use drops or strips to test the CH? What have you been using to add chlorine to the pool? If you use Cal-hypo granules your CH will go up. Have you ever tested the CH of the fill water? If the water source you use to top off the pool has any CH at all your CH in the pool would rise over time since CH does not evaporate. Instead it concentrates in the remaining water and accumulates until you drain and dilute the concentration with fresh, lower CH water. That is why so many pools in drought areas are fighting high CH levels, they are not allowed to drain and refill their pools.

    I'm thinking either the store uses a strip to test or they don't test CH correctly. Have you ever watched them do the tests?
    TFP Moderator
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    Re: high CH

    As far as the CYA being at 125; they said it would fix itself this rainy season.
    I never watched them closely perform the tests. I have been using the 3 inch tabs over the past year plus. I believe why it ran up to 125 recently.
    Been using cal - hypo forever it seems. I understand now my CH should have been climbing. Maybe they tell everyone it is 250. I no longer use cal hypo or 3 inch pucks. At this point I'm just hoping for lot's of rain so I can lower CYA and CH. Thanks, TJ
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

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    Richard320's Avatar
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    Re: high CH

    CYA is only 125?

    Is that a guesstimate, or was it done by diluting the sample 50-50 and doubling the result? You will note the graduations on the CYA view tube are not equidistant. What you think is 125 is more likely closer to 200.

    Replacing water with rainwater is the cheapest solution to your overloaded pool water. I've directed one of the gutter downspouts on my house into my pool. Actually, into the spa, which serves as a settling basin for any dust that comes along. I gain about 3X that way--- 1" of rain will replace 3" of water in my pool. As my average depth is 60", that's a 5% reduction in CH and CYA for ever inch of rain. I wish I could collect more.
    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: high CH

    Quote Originally Posted by Richard320 View Post
    CYA is only 125?

    Is that a guesstimate, or was it done by diluting the sample 50-50 and doubling the result? You will note the graduations on the CYA view tube are not equidistant. What you think is 125 is more likely closer to 200.

    Replacing water with rainwater is the cheapest solution to your overloaded pool water. I've directed one of the gutter downspouts on my house into my pool. Actually, into the spa, which serves as a settling basin for any dust that comes along. I gain about 3X that way--- 1" of rain will replace 3" of water in my pool. As my average depth is 60", that's a 5% reduction in CH and CYA for ever inch of rain. I wish I could collect more.
    I've since lowered to 90. I initially did the diluted sample multiplied by 2. I gave a sample to the pool store and they came up with same reading. For some reason we get same results on CYA, not so on CH test. Ingenious of you routing rain from downspout to pool. Mine are to far away
    28,000 gallon IG pool, plaster, built approx. 1970.
    1 1/2 " plumbing. Pentair, Intelliflo 3 hp variable speed.
    Crystal Water cartridge filter system, model #425
    Dolphin Deluxe 4,

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