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Thread: 6-weeks into SWG conversion - balancing questions

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    Join Date
    Jul 2014
    New York

    6-weeks into SWG conversion - balancing questions


    I am 6-weeks into a SWG conversion. I have spent the first couple weeks playing with filter run-time and SWG percentage. I had it at 7-hours run time at 35%, with FC staying between 4-6. We had a hot week two weeks ago and got some algea and FC dropped to 3 when I tested. I have since raised it to 8-hours per day and 40%. I now have FC at 8.0 after a week of that (but it was cooler).


    I believe I need to lower the PH. I know i should be using Muriatic acid, but I still have some dry acid, so I figure I will use that up and then switch. I also believe I need to raise the CYA (was at 70 when I converted, and has dropped with rain and water additions).

    I see some people need to do weekly acid additions with SWG pools, and some people never do. I would prefer not to do this. Do I need to add Borates to accomplish the lower maintenance of the PH?

    Also, I follow the pool school methods with two exceptions (full disclosure). I use non-chlorine shock when needed to remove the combined chloramines instead of super-chlorinating. It works and I don't mind spending the money since it is easy. I also control the phosphates in the pool (which Pentair does reccomend) with natural chemistry products.
    21' x 28" Grecian Vinyl Pool with fiberglass steps (@17k gallons) with Pentair SuperfloVS, Hayward sand filter with Zeosand, and Hayward gas heater. Pentair EasyTouch 4PSC-IC40 (Pentair IC40 SWG), and Screen Logic interface. 2 skimmers with main drain on the intake side and two primary returns with two low flow bubbler returns at the stairs. Aquabot pool cleaner. TF-100 Test kit.

  2. Back To Top    #2
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    'burbs of Augusta, Georgia

    Re: 6-weeks into SWG conversion - balancing questions

    Your numbers are okay!

    Using non-chlorine shock will skew your test results for CCs.

    As long as you have enough FC (which you certainly do) in the water phosphate removers are a waste of money. But you figure it is a little insurance.... <shrug> ok. Your cash
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Mod Squad Jimrahbe's Avatar
    Join Date
    Jul 2014
    Bedford, TX

    Re: 6-weeks into SWG conversion - balancing questions

    I suggest you let you pH sit at 7.8 for as long as it does. If it goes up then you can reduce it. Two things that can contribute to raising pH are your SWG and your bubblers (or any other aerating water features).

    When my pH goes above 7.8, I normally follow the TFP protocol and add Muriatic Acid to reduce pH down to about 7.1 and then measure the TA level. I then turn on a water feature which provides aeration. I retest pH every few hours and when pH goes up to 7.4 or 7.5, I repeat the process, over and over, until the TA drops to 55 or 60. My pH will then drift back to about 7.8 and stay that way for a while. Depending on the time of the year, anywhere between several weeks to a couple of months or more.

    I never shock or super-chlorinate. I can do this, and so can you, if you will just keep your FC level above your minimum required level. Chlorine CYA Chart

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

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    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Hudson, WI

    Re: 6-weeks into SWG conversion - balancing questions


    I agree with you (NYAVGUY) on adding some stabilizer to get that CYA up closer to 70-80.
    IMHO I'd also do the muratic to lower the pH. 7.8 is OK, I just like mine down near the low limit.
    32K IG Vinyl, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
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    275gal Conway Emerald Spa, bromine floater, indoor
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  5. Back To Top    #5

    Join Date
    May 2015
    Land O Lakes, FL

    Re: 6-weeks into SWG conversion - balancing questions

    This chart should help you determine the right pump run time and SWG %.

    2016 Pool Build: 12k IG Blue Granite Pebblesheen, Travertine Coping & Pavers, Pentair IntelliFlo, Intellichlor, Easytouch, Clean & Clear 320, Heliocol Solar - TF-100 test kit w/ SpeedStir
    SWG Run Time Calculator

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