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Thread: Why chlorine injection

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    Why chlorine injection

    Why would one go with chlorine injection over SWG?

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    Isaac-1's Avatar
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    Re: Why chlorine injection

    There could be any number of reasons, here are a couple, less worry with corrosion without high levels of salt in the water, no need to add another thing to test for (salt), and then of course there is the issue of no expensive failure prone cell to replace, sure pumps have moving parts that need to be replaced from time to time, but they tend to be cheaper than salt cells, and often fail more gracefully giving some warnings before they outright die.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Richard320's Avatar
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    Re: Why chlorine injection

    No wiring.

    And if you regularly drain water to lower high CH or whatever, you don't have all that salt going to waste and killing the lawn.

    At least that's what I figure. I'm out on the patio several times a day smoking anyway, so sloshing some bleach in manually isn't a big distraction.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Why chlorine injection

    Is it easier to control the chlorine levels for seasonal adjustments and bather load over a SWG?

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    duraleigh's Avatar
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    Re: Why chlorine injection

    You can make QUICKER changes to your FC with liquid chlorine but it's not any easier.... turning up the percentage on an SWG is about as easy as it gets.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Why chlorine injection

    From what I have read I cant understand why more pool owners don't use this system. SWG seems so complicated. You guys have me considering a new project. How long does a SWG cell last in a seasonal pool (5 months)?

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    JasonLion's Avatar
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    Re: Why chlorine injection

    A SWG cell will typically last three to five years, longer if your oversize the SWG or have a short pool season.

    There are just as many advantages to having a SWG, you simply didn't ask for them
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Why chlorine injection

    what are the advantages and disadvantages of of both systems?

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    JasonLion's Avatar
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    Re: Why chlorine injection

    SWG has no carrying of bleach/liquid chlorine. Salt improves the feel of the water. SWG systems are readily available and fully supported. Chlorine injection systems are not generally packaged for residential use. SWG has better integration with an automation system, for example turning down the chlorine feed rate when switching to spa mode and providing for remote adjustment using some remote control systems.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Why chlorine injection

    I might be wrong, but I thought some people have posted possible warranty issues if a SWG is used.
    POOL: Intex ultra new in 2014 (32 x 16 x 52) (seasonal; on concrete pad covered with 1.5" extruded or whatever foam insulation sheets - ugly, but comfy); added a through-wall skimmer; I add salt for feel. EQUIPMENT: Pentair SuperFlo pump (1HP, 2SPD); Pentair cartridge filter (200 sq. ft); Pentair MasterTemp natural gas heater (400,000 btu) Climate/Location: Eastern Nebraska

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    tcat's Avatar
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    Re: Why chlorine injection

    More info here: bleach-vs-swcg-t58580.html

    I only spend about $200/yr on Clorox, and can't see the value in more equipment, something that needs replacing every 3 years, possible salt corrosion, at the same or greater cost (salt, recurring equipment cost, & electricity). I have a fairly shaded pool, so that probably makes Chlorine more cost effective (and less work).
    IG pebble, 15,000 gallon
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    BBB

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    Re: Why chlorine injection

    Quote Originally Posted by duraleigh
    You can make QUICKER changes to your FC with liquid chlorine but it's not any easier.... turning up the percentage on an SWG is about as easy as it gets.
    Turning up the dial on a Stenner injection pump isn't so tuff either
    And some folks, especially my better half don't like the salt feel,taste in the pool...I know I know you should not be drinking the water.... but we've been in a few salt pools and I can always taste a slight residual of salt when swimming?? Maybe the few pools we've been in has just had high salt levels?? But I LOVE my BBB liquid Chlorine ool

    24,000 Gallon Vinyl Grecian IG,Triton2 Sand Filter / Pentair Super Flo 1 HP Dual Speed Pump ,
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    Re: Why chlorine injection

    SWG is probably the easiest system and requires the least amount of work. You still have to test of course, but you can go away for weeks and be assured that your pool will maintain FC levels. One minor problem is that the pH will keep going up so you will have to add acid quite often which can impact how long you can leave with no maintenance. Our neighbors added acid every couple of days. One major problem is that if you have natural stone vs. concrete the salt will eat the stone, sometimes within just a few years. Poolbuilders here will not install salt systems with natural stone. One of our neighbors had to have all their flagstone coping replaced.

    Chlorine injection is pretty easy, but not as easy as salt. You have to add bleach (15 gallons) to the tanks probably at least every 3-4 weeks. We take 4-6 week vacations so need to recruit someone to fill the tanks while we are gone.

    The costs are about the same, but with SWG you pay upfront, with bleach you pay over time.
    17,800 gallon, IG pool, 595 sq feet (17x35x4.5 avg rectangle), Hayward 525 cartridge filter, diamondbrite, 2 hp 2 speed hayward tristar filter, Stenner 45mhp10 automatically chlorinating

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