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Thread: Pentair C40 chlorinator issue

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    Pentair C40 chlorinator issue

    Test readings-
    Chlorine- 8.5 (at 35%- usually sits at 5.0 at 40%)
    Ph- 7.4
    TA- 90
    Calcium- 500
    Salt- 3400
    CYA- 40 ( I know a little low) When I tested 2 months ago it was 90, BUT up until the past week or two it was very sunny)

    Chlorinator is 6 months old

    Is my chlorinator acting up or is it a CYA issue OR is it due to lack of sun the chlorine is building up and I can really reduce the percentage?

    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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    Re: Pentair C40 chlorinator issue

    Hi there,
    Sounds like you should turn it down a bit. So you have an IC40. How many gallons of water do you have? If your IC40 is oversized, it could be producing too much chlorine needed for your size of pool but at least you lower your chance of algae. I would turn your cell down a bit though. 8.5 is pretty high. Also, in between 30-50 of your cya is okay during winter as long as everything else is working fine!

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    Join Date
    Nov 2009
    Indialantic, FL

    Re: Pentair C40 chlorinator issue

    Unless you had a massive amount of water change (over half the water in the pool), the CYA couldn't have moved that much in value.

    As we approach winter the Sun's intensity drops, hence chlorine demand also goes down. And if the water temp is dropping that will also slow down chlorine use.

    In my 16K gallon pool I was running an IC-40 at 20% for 10 hours a day. I have cut back to 20% for 8 hours a day and may have to drop it again. Of course this is with a solar cover on now as well as solar panels running so the temp difference is not a player in my case - just the Sun intensity.
    Geometric 16X36', 16K gal, shotcrete, exposed aggregate plaster, acrylic coated concrete deck/cantilever coping;
    Pentair equipment suite (EasyTouch w/wireless, 2 Intellibrites, Intelliflo VS-3050, C&C 200 Filter, IC-40 SWG);
    Heliocol solar panels, Rocky's Roller, Blue Diamond robot

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    In the Industry
    Pool Clown's Avatar
    Join Date
    Sep 2008
    Silicon Valley, CA

    Re: Pentair C40 chlorinator issue

    ...and depending where you live, the unit may stop working all together as the temps drop even more. This is normal, however, the unit may give you errors pointing you in the direction that there is not enough salt. I would just ignore this, set the unit to 0%, and add Cl manually till spring.
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak (Rheem, Rudd), Polaris,
    and Paramount pool cleaning systems.

  5. Back To Top    #5
    benavidescj's Avatar
    Join Date
    Apr 2010
    Fleming Island, FL

    Re: Pentair C40 chlorinator issue

    Ditto, as the temperature drops the chlorine will rise. Turn down the percentage or the runtime of the pump. Unit may start signaling low salt also, but this is unit dependent.
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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