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Thread: UV pool Sanitizer vs. SWG?

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    UV pool Sanitizer vs. SWG?

    Topic split off from this thread: uv-pool-sanitizer-t10552.html (FPM)

    UV treatment versus salt water systems for pools........what are the pro's and con's of each?

    Pool 30 x 17 (23000 gallons) pebble SWG
    Hayward DE filter, Hayward Gas Heater
    Water fall, bubbler, lamar jets, Air blower
    Stone deck, with 3' reverese raise beam pool
    Screen enclosed

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    spishex's Avatar
    Join Date
    Oct 2008
    Hillsborough, NC

    Re: UV pool Sanitizer vs. SWG?

    People who sell SWG's are pros, and people who sell UV's are cons.

    UV only destroys what's in the chamber, leaving no residual in the water. That means anything that accumulates in the pool and doesn't pass through the filtration system will not be affected, and anything that DOES get filtered only gets treated once per turnover. It also means that it does nothing to prevent P2P transmission of disease in the pool.

    SWG's are a way of producing chlorine, which when used properly builds up a residual in the water and does it's killing all over the place, not just in a tube near your filter. Cons of SWG's vs. regular chlorine use are the initial upfront investment, replacement cost of the cell, upward pH drift, and in cases where there's not a lot of rain (indoors or dry climates) splashed out water evaporates and leaves salt behind which can corrode unsealed stone. You'll also see oxidation on non-bonded equipment like lights and ladder rails, but IMO that's a problem with the bonding, not the SWG.

    You can completely sanitize your pool with a SWG. A UV system is supplemental at best.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: UV pool Sanitizer vs. SWG?

    Welcome to TFP!

    UV is never acceptable on it's own. UV is only suitable as an adjunct to one of the three primary sanitizers: chlorine, bromine, or baquacil.

    A SWG is probably the best all around choice available for pools. Bromine is usually the best for spas.

    UV, in combination with a sanitizer, is very nice for use with an indoor pool. UV can take care of the CC which tends to build up in indoor pools. UV is not worth it for an outdoor pool, where sunlight performs the same function for free.
    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: UV pool Sanitizer vs. SWG?

    Quote Originally Posted by spishex
    People who sell SWG's are pros, and people who sell UV's are cons.

    Alan, perhaps this thread will help you:

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