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Thread: What do you set your SWG at?

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    Join Date
    Jan 2010
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    What do you set your SWG at?

    I'm trying to figure out where to set my SWG to keep the pool clean but to run it as little as possible and I'm looking for a santiy check on the setting. I know there are a million variables the effect the setting (pool size, temperature, amount of bathers, etc), but I'd still like to know what the conventional wisdom is.

    When they set up my pool, I'm pretty sure the guys said to set it at about 35% and then bump it up or down from there depending on the chlorine level.

    It seems that if I put it down at 35% I get a very low chlorine level (1.0) and slightly cloudy water. And this is early in the season, with cool temps and people only being in the pool a couple hours on the weekend.

    Anyhow, I'm just trying get a feel for what is "normal" so what do you set your SWG at?

    Thanks!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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    JasonLion's Avatar
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    Re: What do you set your SWG at?

    There is no such thing as "normal". Every pool is totally different.

    If your FC level is too low, turn up the percentage. If your FC level is too high, turn down the percentage. That is the only answer.

    Of course, other levels can affect how much chlorine you need. Take a look at the balancing your pool for use with a SWG article in Pool School or post your current levels for more information.
    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

  3. Back To Top    #3

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    Re: What do you set your SWG at?

    The size of the cell is also a factor. Mine is significantly oversized or my pool. My VSP runs approx 13 hours per day, and my Aqua Logic/Plus (always forget the one- it has a digital display) is set on 15% and I struggle to keep the chlorine down below 10 lol.

    Prior to my VSP I used to run my Superpump 8 hours a day (Here in GA) and kept my cell about 60% or so.

    I would just set it as you were recomended, keep the same run times, and check it a couple times per week. Adjust it up or down as need be.

    Good Luck!
    16 x 32 Grecian Vinyl. Salt-Aqua Plus PS-4, Hayward Pro Series Sand Filter, Hayward Ecostar SP34000vsp, Gulfstream HE-125-T-A Heat/Cool heat Pump

  4. Back To Top    #4

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    Re: What do you set your SWG at?

    And make sure your CYA is within the range specified by the SWG manufacturer. SWGs just don't seem to work well when the CYA level is too low.
    20 x 40 vinyl IG. SWG. Solar. Ikeric VS pump.

  5. Back To Top    #5
    Glock30's Avatar
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    Apr 2012
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    Massachusetts, USA
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    Re: What do you set your SWG at?

    Another way to increase your FC is to run the SWG longer.
    Example: I am currently running my SWG at 30% for about 5 hours a day.
    This gives me an "in range" fc reading consistantly but I am still tweaking.

    My SWG is oversized, this the 30%. Most run at 40-60%
    18' X 36' Inground Pool 26,000 gallons. SuperMax 27mil/27mil Vinyl Liner-Installed Fall 2011
    Pentair Intellipro Programable Pump (Model 011018) // Pentair S8M 500 Cartridge Filter // Circupool RJ45 Salt Chlorinator
    2 Hayward Skimmers // 3 Returns // 2 Savi Melody Pool lights // TF-100 Test Kit.

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    Re: What do you set your SWG at?

    One point often overlooked by many owners (including me) is that one can get into a situation where there is a presentant ongoing biological problem and yet the chlorine levels are correct. The difference is that the SWCG is being run at a higher setting than if the pool did not have the problem. So for example without the problem you can run the SWCG at 30% with an FC of 5, and with the problem SWCG at 50% and FC of 5! Water looks clean in both cases. The only way to really tell is to look at your overnigh FC loss and/or shock the pool.

    That being said you do have a large pool, so will have to run the SWCG longer and at higher settings than other people with smaller pools.
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

  7. Back To Top    #7

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    Re: What do you set your SWG at?

    Thanks everyone!

    My CYA is low, but I'm bringing it up. I was just a little worried based on what the pool guy said and what I was seen, but these comments are reassuring. Plus, it could have been a throwaway comment by the pool guy!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

  8. Back To Top    #8

    Re: What do you set your SWG at?

    My SWCG is oversized and I have it set at 10% for 8 hours/day. All my levels are within limits.

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