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Thread: Rising CH in recently refinished pool

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    Rising CH in recently refinished pool

    The pool was refinished in June and now has pebblesheen surface. Pool looks great, family is loving it.... but my CH started at 350 on 7/6 and has been steadily rising. Today it is 400... Pool math is suggesting to replace the pool water, but I live near DFW airport and they significantly increased water prices last year so I'm wondering if there is an alternative to pumping a 1/3 of the water out of the pool?
    June 2016 remodel IG 14k gal Blue Surf Pebble Sheen : Hayward Star Clear Plus C12002 : Pentair Challenger 2HP 1' : Century Pool and Spa Motor 3/4 HP 2' : Pentair Master Temp heater : Polaris 280 pool sweep : TF-100/Speed Stir

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    Re: Rising CH in recently refinished pool

    What is the CH of your fill water?

    Can you post a full set of current test results - including water temp?

    You can easily manage a CH much higher than 400 by carefully monitoring your other levels. No need to replace any water just because of a CH of 400.

    Oh, can you do us a favor and edit your signature to be more specific with your equipment - including manufacturer and model numbers, along with what test kit you're using? This will make it easier for us to offer suggestions as we don't need to review previous posts or ask you for that info.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Mod Squad pooldv's Avatar
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    Re: Rising CH in recently refinished pool

    Agreed, CH is OK as long as you manage CSI, which you should be doing anyway with the high scaling water in DFW. Keep your CSI between -0.3 and 0, PoolMath will give you the number after you enter ALL of your test results. Tweak OH and TA to adjudt.

    More here, Pool School - Calcium Scaling
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Rising CH in recently refinished pool

    CH of fill water is 125
    Chemistry from today: FC 1, pH 7.6, TA 90, CH 400, CYA 50, Temp 90, CSI 0.25
    I then added Muriatic acid, Chlorine and Baking soda per Pool Math recs.
    June 2016 remodel IG 14k gal Blue Surf Pebble Sheen : Hayward Star Clear Plus C12002 : Pentair Challenger 2HP 1' : Century Pool and Spa Motor 3/4 HP 2' : Pentair Master Temp heater : Polaris 280 pool sweep : TF-100/Speed Stir

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    Re: Rising CH in recently refinished pool

    With a CYA of 50, your FC should never go below 4. See here: Pool School - Chlorine / CYA Chart
    And FC below 4 leaves you wide open to getting an algae bloom. I'd suggest you do an OCLT to verify you don't already have an issue - Pool School - Perform the Overnight FC Loss Test (OCLT)

    ^^^ The reason I mentioned the above first is because it's the most important right now. ^^^
    ____________________

    Back to your rising CH

    Adding baking soda raises TA - you need to lower your TA. Work on getting the TA down into the 60-70 range. This will also slow the rate the pH rises.

    A fill water CH of 125 isn't too bad - mine in AZ is about twice that. Your CH will continue to rise as water evaporates and it gets replenished with tap water. At some point, the CH may become unmanageable, but you have a lot of headroom right now. There are several members managing CH over 1000 and not having scaling issues.

    Your CSI is near the top end of what we recommend, but you can easily get it to be slightly negative by lowering your TA and keeping your pH in the 7.2 to 7.5 range.

    Play around with PoolMath and see what lowering your TA and pH does to the CSI. Also look at what an increase in CH does to CSI and how lowering TA/pH will help keep CSI in check.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Re: Rising CH in recently refinished pool

    Thank you! Very helpful
    June 2016 remodel IG 14k gal Blue Surf Pebble Sheen : Hayward Star Clear Plus C12002 : Pentair Challenger 2HP 1' : Century Pool and Spa Motor 3/4 HP 2' : Pentair Master Temp heater : Polaris 280 pool sweep : TF-100/Speed Stir

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    Re: Rising CH in recently refinished pool

    Let us know how the OCLT goes.

    As a reminder, when you do the tests.... hold the reagent bottles completely vertical and allow the drops to fully form on the tip before they drop. Take your time and don't squeeze the drops out too fast - should be about 1 second between drops. This will help increase the accuracy of the testing.

    Here's how to lower your TA: Pool School - Lower Total Alkalinity
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Re: Rising CH in recently refinished pool

    Last night FC 5.5, this morning 5.0, so I'm assuming that I should focus on lowering the TA now???
    June 2016 remodel IG 14k gal Blue Surf Pebble Sheen : Hayward Star Clear Plus C12002 : Pentair Challenger 2HP 1' : Century Pool and Spa Motor 3/4 HP 2' : Pentair Master Temp heater : Polaris 280 pool sweep : TF-100/Speed Stir

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    Mod Squad pooldv's Avatar
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    Re: Rising CH in recently refinished pool

    Your TA isn't all that high. I'm not sure actively lowering it is required. It will lower on its own as you add acid to lower PH and eventually PH and TA will reach equilibrium.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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