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Thread: CH at 900ppm. Should I be concerned?

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    Join Date
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    CH at 900ppm. Should I be concerned?

    The CH level in my pool has been steadily creeping up since last summer. It's now at 900ppm. The water is perfectly balanced otherwise and I'm not experiencing any problems with cloudiness or scaling. Should I be concerned?

    Currently I'm at:
    TC 3.5
    pH 7.3
    TA 60
    CYA 30
    borate 40ppm

    Last June the CH was at 250 ppm. I have a Liquidator and use only household bleach to chlorinate. The fill water comes in at 80ppm CH. I am in the desert, so there is a lot of evaporation and refill, but I'm surprised that the CH would get this high. I hate to drain & refill the pool because its perfect otherwise. Any advice or suggestions? BTW, its a white plaster pool.
    18k gl white plaster pool/spa
    48sq ft FNS Plus DE filter
    3/4hp WhisperFlo circ. pump
    MasterTemp 400
    4gl Liquidator
    full sun in the Calif. desert

  2. Back To Top    #2
    Guest

    Re: CH at 900ppm. Should I be concerned?

    Are you sure that is accurate? How are you testing?

    With fill water of only 80, that doesn't make sense to me (and I am pretty "involved" with CH issues ). I can't remember the last time I was involved with a pool with the CH levels over 600 ppm!

    Do not drain and refill now, if that is what you decide to do! The weather is too hot and you will run the risk of your plaster delaminating. That level is way out of "acceptable" range (you should be between 200-400 ppm for plaster), so it is good that you are paying attention! Even with the huge amount of evaporation that you get, it still seems like something is off on the time frame from last June to now.

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    frustratedpoolmom's Avatar
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    Re: CH at 900ppm. Should I be concerned?

    I agree - I would try to get a few different samples/tests to confirm if that reading is accurate.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: CH at 900ppm. Should I be concerned?

    I use the CH test in the TF Test kit. Should I have it tested at the pool store to confirm?
    18k gl white plaster pool/spa
    48sq ft FNS Plus DE filter
    3/4hp WhisperFlo circ. pump
    MasterTemp 400
    4gl Liquidator
    full sun in the Calif. desert

  5. Back To Top    #5
    Guest

    Re: CH at 900ppm. Should I be concerned?

    No, trust your results. They will be way more accurate than the pool store!

    Just a crazy swing, which led me to ask. It would take a whole lot of fill water (at 80 ppm) to do what you are saying is happening in such a short time!

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    Re: CH at 900ppm. Should I be concerned?

    My friend, whose fill water is not high in CH has a CH of 700. This is from the pool guy throwing in Cal Hypo for months/years. BTW.... no CYA either. I brought that up to 50 for her.

    Her TA was 60 so we left it at that until I can get some time to get over there, let out water and refill, and adjust. At present, her CSI is 0.09 which indicates to me that it is okay in the short run. pH stays pretty much at 7.5. Her plaster is white and very old, and started popping plaster a few years ago, which pool guy patched. Patches are holding. I have no idea how much calcium scaling she has; maybe little, maybe a lot. I had her move the Cal Hypo to the garage!!!! Pool guy comes over several times a week now and adds bleach for her. It was 5 when I had her check it a couple of hours ago. This was after pool guy blindly added 182 oz bleach this a.m. She's battling mustard algae so this week I'm going over to let out some water, adjust, then start the MA shock process. I'm selling her my Polaris 280, reconditioned with lots of new part since last year and just installed bearings, with a bunch of bags, my booster pump, with new motor last year, for a ridiculously low price (her booster pump is squealing and her Polaris is unusable right now - she's using my old Aquabot) AND I'm going to threaten her with yanking them all out if she doesn't spend 5 minutes a day on the pool.

    I've been trying to go over there for weeks but just haven't had the time.

    gg=alice
    1981, 25K, IG, Blue Plaster 1996, somewhat oval, widens a bit at shallow end, 1.5" pipes, 2" at Pad, 1 separate main drain, 1 skimmer, 4 returns + dedicated cleaner return, 10 ft deep end with very fast decline from shallow, Pentair Quad 80 DE, Pentair Intelliflo VF, 3/4 HP Booster Pump (equipment pad about 8 ft below top of pool), Challanger 3/4 Trash/Emergency Pump 120v, Polaris 280 (pressure), iRobot Verro cleaner (robotic), Aquabot Turbo (robotic), Jacuzzi Tracker 4X (vacuum) Pool Blaster (Buster), Two (2) PoolSkims, Solar Breeze (solar powered top skimmer) (beta to ver. 2, release date 2010), ColorSplash LED replacement bulb. Aries 550 gal separate spa, 2002 (our 3rd and BEST spa) , BBB-Bromine

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    Re: CH at 900ppm. Should I be concerned?

    Quote Originally Posted by simicrintz
    Are you sure that is accurate? How are you testing?

    With fill water of only 80, that doesn't make sense to me (and I am pretty "involved" with CH issues ). I can't remember the last time I was involved with a pool with the CH levels over 600 ppm!

    Do not drain and refill now, if that is what you decide to do! The weather is too hot and you will run the risk of your plaster delaminating. That level is way out of "acceptable" range (you should be between 200-400 ppm for plaster), so it is good that you are paying attention! Even with the huge amount of evaporation that you get, it still seems like something is off on the time frame from last June to now.
    Has anyone been throwing Cal Hypo in the pool, for "shocking", etc. See my post above.

    gg=alice
    1981, 25K, IG, Blue Plaster 1996, somewhat oval, widens a bit at shallow end, 1.5" pipes, 2" at Pad, 1 separate main drain, 1 skimmer, 4 returns + dedicated cleaner return, 10 ft deep end with very fast decline from shallow, Pentair Quad 80 DE, Pentair Intelliflo VF, 3/4 HP Booster Pump (equipment pad about 8 ft below top of pool), Challanger 3/4 Trash/Emergency Pump 120v, Polaris 280 (pressure), iRobot Verro cleaner (robotic), Aquabot Turbo (robotic), Jacuzzi Tracker 4X (vacuum) Pool Blaster (Buster), Two (2) PoolSkims, Solar Breeze (solar powered top skimmer) (beta to ver. 2, release date 2010), ColorSplash LED replacement bulb. Aries 550 gal separate spa, 2002 (our 3rd and BEST spa) , BBB-Bromine

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    Re: CH at 900ppm. Should I be concerned?

    Thanks to everyone who responded to my post. Just had the water tested at the pool store. According to their test, CH is at 400ppm! Is it possible that my test chemicals have gone stale and are giving me a false reading? I have a TF test kit. The test chems. are about a year old.
    18k gl white plaster pool/spa
    48sq ft FNS Plus DE filter
    3/4hp WhisperFlo circ. pump
    MasterTemp 400
    4gl Liquidator
    full sun in the Calif. desert

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    JasonLion's Avatar
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    Silver Spring, MD
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    Re: CH at 900ppm. Should I be concerned?

    Historically, pool stores are much more likely to make mistakes than home owners using the TF-100.
    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

  10. Back To Top    #10
    Guest

    Re: CH at 900ppm. Should I be concerned?

    We just finished a pool that had CH of 690. The pool had also just received an in pool acid wash (they lowered the pH down to 0; it is a PebbleSheen pool) and the folks wanted to address their high CH levels. We let the system run for longer than usual, and came back to a 50 ppm CH pool Ended up going to the pool store to buy some calcium chloride, and the guy behind the counter looked at us like we had three heads, asking for this in So. California! The bag was so old that it looked like Moses carried it across the Red Sea when he parted it! I think he felt bad, since he gave us 15% off!

    Did you finally get an accurate reading on your CH? Just wondering how you are making out with it.

  11. Back To Top    #11

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    Re: CH at 900ppm. Should I be concerned?

    Quote Originally Posted by geekgranny
    Quote Originally Posted by simicrintz

    Has anyone been throwing Cal Hypo in the pool, for "shocking", etc. See my post above.

    gg=alice
    I did per pool store's testing results for algae. That was about 4 weeks ago. The ch level is 470 this morning per TF100 test kit.
    IG pebbletec pool: size of pool: 27,000 gal; filter: cartridge - Hayward Superstar Clear; pump size: 1.5 HP; TF 100 Test kit - got it on 7-29-10; The Pool Cleaner-4-wheel suction model; Pool calculator: http://www.poolcalculator.com/; bleach calc: http://troublefreepool.com/files/BleachCalc262.exe

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