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Thread: I'm Confused

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    I'm Confused

    Everything I've read here says pH will rise when using a SWCG. However, while setting up and testing a spread sheet I've developed to determine approximate ozs of Chlorine gas produced for various running time and production %s for my SWG, and plugging the resulting values into Pool Math's "Effects of adding chemicals", The results show increases in FC as expected but DECREASES in pH. As the amount of Chlorine gas produced goes increases so is the decrease of pH getting higher. Having run my SWG for about a month now, I haven't seen any increase in pH and have actually seen a net decrease. Not much, but still a decrease.
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
    Intermatic P1353ME digital timer w/freeze sensor
    CircuPool Si-45 SWCG System
    Polaris 280 vacuum/Polaris PB4-60 boost pump
    Pentair IntelliFlo VS 3hp Pump--Pentair sand filter

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    JasonLion's Avatar
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    Re: I'm Confused

    Don't assume that what PoolMath says about chlorine gas has anything at all to do with a SWG. For PH change purposes the two are essentially unrelated. There are additional reactions taking place inside the SWG beyond the chlorine gas dissolving.

    A SWG, in and of its self, has essentially zero effect on PH (baring chlorine out gassing, but that is unusual). But aeration combined with high TA will raise PH. Most pools have little aeration without a SWG. A SWG provides aeration, making PH increases more likely. If you manage your PH and TA levels correctly there is no PH increase.
    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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    Re: I'm Confused

    Thanks Jason, I just thought chlorine gas is chlorine gas whether produced by a SWG or pumped in by some pool maintenance co. The problem is I'm going on vacation and will be away from my pool for2-3 wks, more than I've been since inheriting my pool. Before, I've sometimes come back to a pool with a bunch of leaves and other debris but adequate FC levels after putting a few bottle of bleach and 3 pucks in a floater. That probably the biggest reason why I installed the SWG. Please see my new thread, I'd appreciate having your expert input on the questions I raised there.
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
    Intermatic P1353ME digital timer w/freeze sensor
    CircuPool Si-45 SWCG System
    Polaris 280 vacuum/Polaris PB4-60 boost pump
    Pentair IntelliFlo VS 3hp Pump--Pentair sand filter

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    JasonLion's Avatar
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    Re: I'm Confused

    Once dissolved in the water, chlorine is chlorine. But in the process of being dissolved in the water there will be some secondary effects depending on the original form of the chlorine. Chlorine gas is acidic like trichlor and dichlor, while a SWG is PH neutral like bleach and cal hypo.
    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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    In the Industry

    duraleigh's Avatar
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    Re: I'm Confused

    Please see my new thread, I'd appreciate having your expert input on the questions I raised there.
    It is not easy for a frequent responder to chase a new thread......this is a busy forum and responders answer new posts but typically do not have the time to search for whatever post an OP might have placed elsewhere.

    That's one of several reasons why OP's are encouraged to keep all their pool information in one thread......even though the topic may change somewhat, it is still the same pool and frequent responders like to see the whole "story".
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: I'm Confused

    I see, that sorta explains why I haven't noticed an increase in pH. Thanks again!! I used to run an aerator, but haven't since last fall (I got tired of having to untangle my Polaris from it) I also bought a full set of ladder guards that work pretty good so far. I haven't installed the boron GAUD yet due to cold water temps. Maybe today!!! Water temp was 78 yesterday but the air temp is supposed to get up to 93 today SWIM TIME!!!
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
    Intermatic P1353ME digital timer w/freeze sensor
    CircuPool Si-45 SWCG System
    Polaris 280 vacuum/Polaris PB4-60 boost pump
    Pentair IntelliFlo VS 3hp Pump--Pentair sand filter

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    Re: I'm Confused

    You can think of an SWG simultaneously producing both chlorine gas (which dissolves in water to become chlorine and acid) and the equivalent of lye which is a base (and hydrogen gas as well). So the net result is basically the same as if you had added bleach or chlorinating liquid except there is no buildup of salt. See the "Salt (SWG) Pool" section in this post for technical details.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: I'm Confused

    Mind boggling, but I'm confused no more! Thanks everyone for your help!!!
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
    Intermatic P1353ME digital timer w/freeze sensor
    CircuPool Si-45 SWCG System
    Polaris 280 vacuum/Polaris PB4-60 boost pump
    Pentair IntelliFlo VS 3hp Pump--Pentair sand filter

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