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Thread: Some Newbie SWG and related questions

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    Join Date
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    Question Some Newbie SWG and related questions

    Friends,

    Brand new pool owner here. Details in signature. No issues yet -- the water is clear, warm already, and my family is loving it!

    Waiting on my Taylor 2006 test kit to arrive tomorrow, but here are some pool-store tests from yesterday:

    FC 3
    TC 3
    TA 45
    PH 7.2
    CYA 70
    CH 25 (60 the previous day at another store)

    I know I need to raise the TA and PH (I already added about 6 pounds of baking soda), but can anyone tell me what washing soda or soda ash are? Please tell me I can get it somewhere other than a pool store?

    Both stores warned me about my extremely-low CH -- one said my liner was likely to deteriorate and crack. But I read here in Pool School that it is not really a concern for SWG above-ground pools?

    I know that my mileage may vary, but what would be a good starting point for how many hours per day to run the SWG? The default setting of 20 seems high. I lowered it to 10 after the first day, and hope to test it myself tomorrow.

    Going forward, I expect I will need to add CYA occasionally, and possibly some chemicals to adjust PH/TA -- in my scenario, would you expect my PH/TA to tend to drift up, or drift down? Any other chemicals that I should have on hand ready to use when the occasion arises?

    One store suggested shocking your pool once a week. Am I completely clueless? I thought if you kept your numbers in good shape, you wouldn't need to ever shock it, except during Spring startup? If I misinterpreted that, please help me understand!

    Thanks so much!
    24' round 52" AG "Mystic II" salt-ready model - 14,500 gallons. Installed August 2016 in Charlotte NC area.
    Bottom drain! Pentair/SandDollar 1.5HP pump and sand filter. Saltron Retro side-mount SWG.
    Partial shade from both evergreen and deciduous trees -- a mixed blessing!

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    Mod Squad Jimrahbe's Avatar
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    Re: Some Newbie SWG and related questions

    Mark,

    Welcome to TFP...

    Your pH is just fine, I'm not sure why you are screwing with it. Anything between 7.2 and 7.8 is ok. Although your TA is low, with a SWG, both your pH and TA will soon rocket up there, so for right now I would leave them alone.

    My understanding is that with a liner pool, CH is not relevant, so let's see what other here say about that...

    I have three pools and have never "shocked" any of them in the last three years. As you say, if your numbers are good, you should never have to add shock.

    Assuming your above numbers are good, which we have no way to tell at this point, your FC of 3 is at the absolute minimum you want to be. You should really be trying to maintain an FC of 5 or 6 ppm.

    See this.. Chlorine CYA Chart

    You need to run your pump for how many hours it takes to generate the required amount of Chlorine. So, you either need to run your pump more, or increase the percentage output of your SWG. It is much better to generate too much and then cut back, then it is to generate too little and try to catch up.

    Thanks,

    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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    Mod Squad YippeeSkippy's Avatar
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    Re: Some Newbie SWG and related questions

    Ohmy. Those pool stores are cluelss. You're correct- vinyl lined pools don't need calcium *unless they have a heater* and the heater needs it. And the only reason a pool "needs shocking weekly" is to sell more product!

    I'd start at 6 hours at 50%, and then daily testing. If you want to run it more just cut down the SWG %, and if you only want to run the pump less just turn the % up. You'll find your happy place pretty soon. Here is one guide to recommended levels--> Pool School - Recommended Levels

    Washing soda can be found in the laundry aisle, often next to the Borax. It comes in a box.
    My Amazon Smile for November12K 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 pooldv's Avatar
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    Re: Some Newbie SWG and related questions

    More about pool chems here, Pool School - Recommended Pool Chemicals
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Some Newbie SWG and related questions

    Thanks for the good advice!

    Got my new Taylor 2006 Kit today and here are my first results:

    FC 3.2
    CC 0.2
    pH 7.8
    TA 100
    CH 30
    CYA 50

    Looks like I need to raise both FC and CYA in the near future. Should I add bleach or rely on the SWG running longer to bring up the FC level?

    My SWG does not have a percentage setting -- only the number of hours to run until it turns off. It only ran 10 hours the last two nights, so I bumped it up to 16 hours for now. Side question: with an over-the-edge-of-the-pool SWG, is it strictly necessary to have the pump circulating water in the pool while the SWG is on? (So far I have always had the pump/filter running)

    Is my TA now too high? I know the pH is on the high end.

    Let me know your thoughts, and Thanks!
    24' round 52" AG "Mystic II" salt-ready model - 14,500 gallons. Installed August 2016 in Charlotte NC area.
    Bottom drain! Pentair/SandDollar 1.5HP pump and sand filter. Saltron Retro side-mount SWG.
    Partial shade from both evergreen and deciduous trees -- a mixed blessing!

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    Re: Some Newbie SWG and related questions

    Hello
    Your minimum FC for a CYA of 50 is 4. Anything below that will lead to something growing / unsanitary conditions.
    Pool School - Chlorine / CYA Chart
    Use Pool Math to determine the right amount of bleach. Do not wait on the SWG.

    TA is fine for now.

    With a SWG pool, CYA is recommended at 70-80. If your pool season is not much longer, I am not sure that I would worry about it this year if your SWG can keep up but it may not be able to with the .4lbs of Chlorine that it generates per 24 hour period. See the chart. With a daily loss of 2ppm of FC, you need to run it 14.5 hours per day. If you are loosing 3ppm per day, it needs to run about 22 hours. See the chart. Your pump should be running at the same time.

    PS: the SWG is undersized for your pool.

    I would do a OCLT to ensure there is nothing growing and you don't need to SLAM. To do this, raise your FC to 8 using Pool Math and turn off the SWG an hour before you do the test after the sun goes down. Keep the pump running and keep the SWG off.

    Matt
    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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    Re: Some Newbie SWG and related questions

    This is great info, Matt.

    I did not know what my unit output was, so that and the calculator are very helpful -- thanks for creating the spreadsheet and making it available to use TFP peeps!

    They are advertising the SWG as good for up to 20,000 gallons, but that is marketing-speak, obviously!

    -- Mark
    24' round 52" AG "Mystic II" salt-ready model - 14,500 gallons. Installed August 2016 in Charlotte NC area.
    Bottom drain! Pentair/SandDollar 1.5HP pump and sand filter. Saltron Retro side-mount SWG.
    Partial shade from both evergreen and deciduous trees -- a mixed blessing!

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    Re: Some Newbie SWG and related questions

    Quote Originally Posted by markcw97 View Post
    This is great info, Matt.

    I did not know what my unit output was, so that and the calculator are very helpful -- thanks for creating the spreadsheet and making it available to use TFP peeps!

    They are advertising the SWG as good for up to 20,000 gallons, but that is marketing-speak, obviously!

    -- Mark
    Yes, it is fine assuming you want to run it 24/7. Definitely marketing speak.

    TFP recommends 2 to 3 times the stated capacity. On my 12k pool, i have a 40k capacity unit, wish i had a 60k fo my situation.
    Matt
    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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