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Thread: Do Chlorine Generators Recycle Salt?

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    Do Chlorine Generators Recycle Salt?

    Recently I found an article on an autopilot site. The quote reads this:

    "The main benefit a salt chlorine generator offers is its ability to recycle salt. During the process of electrolysis, as used in a salt chlorine generator to produce chlorine, the chlorine breaks down further into hypochlorous acid and hypochlorite ions, which are sanitizers. After the hypochlorous acid and hypochlorite ions neutralize the contaminants in swimming pool water, they revert to salt, again, only to be broken down into chlorine for another cycle."

    I've never heard anything like this before. Is this true, partially true, misleading, etc.? If it recycles the salt then why would you ever need to add salt again. Simply bring it up to 3500ppm and you're set.

    Like some clarification on this one.

    Thanks
    17K Inground Pool
    Cartridge Filter
    Plaster

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    pabeader's Avatar
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    Re: Do Chlorine Generators Recycle Salt?

    In normal practice, this is exactly right. You never have to add any salt if you never have any water exchange. But, as most pools have some form of fresh water introduced, there is a need to top off the salt level from time to time.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Do Chlorine Generators Recycle Salt?

    my swg pool and tub only need salt when I drain and fill or replace water from splashout. When evaporation occurs the salt doesnt come out. When my pool had an underground leak the salt level went down indicating a problem.
    113,000L indoor saltwater pool built in 1981. 1000lb sand filter, filed with quartz with 2hp single speed pump.
    4602L indoor saltwater whirlpool built in 1981. 500lb sand filter with 2hp single speed pump. Both controlled by chemtrol250 and Hayward pro swg's.

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    GaryT58's Avatar
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    Re: Do Chlorine Generators Recycle Salt?

    Will repeat from above. Will only lose salt from runoff- be it overflow, backwash, splash out, ... Not from evaporation. So rather than purchasing chlorine, you have up front cost of salt water chlorine generator (SWG) and salt. Then electricity. And eventually replacing the cell.
    38'x16' Fiberglass pool - 3.5' - 8' deep - 19,000 gallons. AutoPilot Total Control SWG (RC-52 cell), Pentair SuperFlo VS, Pentair SD70 Sand Filter, Coverstar Automatic Cover, 10' board, PAL Treo lighting, Polaris 9550 Sport robot, Lamotte ColorQ Pro 7 test kit.

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    Re: Do Chlorine Generators Recycle Salt?

    The chlorine atoms basically gain and lose electrons. With 8 electrons in the outer shell, the chlorine atom is a chloride ion. As the chloride goes through the cell, it loses an electron to become chlorine. As chlorine oxidizes something, it gains electrons and becomes chloride again.

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    JoyfulNoise's Avatar
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    Re: Do Chlorine Generators Recycle Salt?

    I have never had to add salt to my SWG pool since starting it up years ago.

    Municipal water contains chloride (mine is 160ppm). Also, any chlorine source be it solid chlorine (trichlor, dichlor or cal-hypo) as well as liquid chlorine eventually adds salt because chlorine is converted to chloride once it reacts with something.

    Muriatic acid also adds chloride to your pool as it is hydrogen chloride.

    All pools are salt water pools...
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Do Chlorine Generators Recycle Salt?

    Quote Originally Posted by JoyfulNoise View Post
    ...

    All pools are salt water pools...
    But not all pools are SWG pools...YET!!!
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

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    AUSpool's Avatar
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    Re: Do Chlorine Generators Recycle Salt?

    Quote Originally Posted by JoyfulNoise View Post
    I have never had to add salt to my SWG pool since starting it up years ago...
    With lots of rain we're the exact opposite, been through truck loads of the stuff. The world almost ended when supplies ran out after our last big flood.
    Steve.
    30,000L (8,000g) Pebblecrete | Davey 3sp Eco pump | Poolrite sand filter & SWCG |
    Waterco solar panels & Astral E140 pump| K2006, CCL reagents, BlueDevil pH, Salt meter & K1766 | Town water - pH 7.2, TA 50, CH 60 | Esky full of coldies |

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    Divin Dave's Avatar
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    Re: Do Chlorine Generators Recycle Salt?

    This is pretty much right. the salt in the water goes through the SWG plates and an electrolysis reaction and chlorine is generated and sent to the pool. Just as James described it. Once the chlorine does it's job, it turns into salt again.

    You only have to replenish the salt occasionaly. The salt level will drop due to splash out, overflow from heavy rains, backwashing the filter, etc.

    It sure is nice not to have to put chlorine into the pool every day or use chlorine pucks which also add other unwated chemicals to the water, or worry about it if you go away from home for a few days. The SWG will keep on doing it's thing and keep the pool chlorinated.

    As an added benefit, the bit of salt in the water feels nice on the skin. The feel of salt water has been described and I would agree, as a little bit 'silky'.

    Quote Originally Posted by RobRM View Post
    Recently I found an article on an autopilot site. The quote reads this:

    "The main benefit a salt chlorine generator offers is its ability to recycle salt. During the process of electrolysis, as used in a salt chlorine generator to produce chlorine, the chlorine breaks down further into hypochlorous acid and hypochlorite ions, which are sanitizers. After the hypochlorous acid and hypochlorite ions neutralize the contaminants in swimming pool water, they revert to salt, again, only to be broken down into chlorine for another cycle."

    I've never heard anything like this before. Is this true, partially true, misleading, etc.? If it recycles the salt then why would you ever need to add salt again. Simply bring it up to 3500ppm and you're set.

    Like some clarification on this one.

    Thanks
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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