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Thread: High FC Level in SWG Pool

  1. Back To Top    #1

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    High FC Level in SWG Pool

    Current reading:
    FC = 15
    PH = 7.5
    Alk = 80
    Salt = 3300
    CYA = 70

    My FC level has been high since mid October and after adjusting the SWG output knob down several times, I finally turned the switch off. The switch has been off for a week now and the FC reading hasn't changed. I'm using the Taylor kit and my reagents are fresh. The weather is cooler so I know the FC level is not decreasing as much as during the summer heat. However, I would think it should have decreased some in a week. I live in North Florida and while the unit has been off we've experienced a few cloudy and cooler days and nights. My pool is also in a screen enclosure. During the summer, my pump runs 12 hours a day. I've since scaled back to 6 hours/day.

    I'm perplexed and have many questions......

    Is the SWG is working correctly? Everything seems fine as there are no flashing lights, etc. Could there be a problem with the adjustment knob and it was "overproducing"?

    Is it normal that my FC level is not decreasing with the SWG off? Also, can I unplug the power cord to the SWG power box while the unit remains off?
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

  2. Back To Top    #2
    frustratedpoolmom's Avatar
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    Re: High FC Level in SWG Pool

    If the conditions are right, it would certainly be possible for the FC to remain stable - if there were no organics or sunlight to consume the chlorine...I've experienced that in my own pool. If no one has been swimming, if the pool doesn't get direct sunlight... Does your screen enclosure have a roof?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  3. Back To Top    #3

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    Re: High FC Level in SWG Pool

    Quote Originally Posted by frustratedpoolmom
    If no one has been swimming, if the pool doesn't get direct sunlight... Does your screen enclosure have a roof?
    The enclosure is all screen, including the roof. I don't have a heater so we stopped swimming a month ago. I'm sure you are correct that with the cooler weather and a few cloudy days the chlorine is not being consummed as quickly. I'll check the FC level every couple of days and will restart the SWG when warranted.
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

  4. Back To Top    #4

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    Re: High FC Level in SWG Pool

    what's your water temperature currently? there is a minimum temperature, below which chlorine is virtually not used up

  5. Back To Top    #5

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    Re: High FC Level in SWG Pool

    Temp is 66 degrees during the day.
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

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    Re: High FC Level in SWG Pool

    Cold water and the sun being low will really reduce chlorine use. I'm not doing as well as you are, losing around 2.5ppm per week. But your CYA is twice what I have, so I'd expect you to lose less.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  7. Back To Top    #7

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    Re: High FC Level in SWG Pool

    Quote Originally Posted by jagfan
    Temp is 66 degrees during the day.
    yeah, a lot of SWGs actually turn of around 50-55 so you are very close to it
    I'd say you can safely turn it down to minimum, or even completely, and just monitor your chlorine level.

  8. Back To Top    #8

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    Re: High FC Level in SWG Pool

    Your SWG is probably operating normally. I'm in Mid - Southern Florida, with a screen enclosure, 76 degree temp, but my FC level has been above 10 for a month now. I've had my SWG on the lowest setting (10%) for 3 weeks and off this past week and still it is still above 10.
    25' x 13' Roman, 12000 gal IGP, Plaster, with 500 gal Spa
    SWG, 1 HP Max Flo Pump, C-900 cartridge filter
    Solar heat

  9. Back To Top    #9

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    Re: High FC Level in SWG Pool

    I'm in Dallas area. Water fell below 60 F past few days. Much more chlorine use above 65 F. Some days are in high 70's; nights 40s-50s. Chlorine use has dropped drastically even with leaves and dust blowing in. Leaves and dust sit in pool overnight till I run pump during day and still isn't consuming chlorine as much as I thought it would. Doggies aren't getting in pool nearly as much either. We had a few inches of rain the other day and it took it down less than I figured it would, too. Sun only hitting 1/3 of pool for about 3 hrs a day now, and with about 1/3 of days being overcast. I've been raising my CYA, by hanging CYA filled stocking into pool. In summer it dissolved in about 24 hours. It has taken almost 2 weeks for it to dissolve now. I did an AA treatment a few weeks ago. With water temps in 60's the process took almost two weeks vs a couple of days when temps are near swimming temps.

    As far as I can see everything is really slowing down, just as our experts advised. It's really nice not to have to take readings so much. My CYA read 30 the other day but I'm expecting it to increase a bit more since everything has slowed down so much.

    gg=alice
    1981, 25K, IG, Blue Plaster 1996, somewhat oval, widens a bit at shallow end, 1.5" pipes, 2" at Pad, 1 separate main drain, 1 skimmer, 4 returns + dedicated cleaner return, 10 ft deep end with very fast decline from shallow, Pentair Quad 80 DE, Pentair Intelliflo VF, 3/4 HP Booster Pump (equipment pad about 8 ft below top of pool), Challanger 3/4 Trash/Emergency Pump 120v, Polaris 280 (pressure), iRobot Verro cleaner (robotic), Aquabot Turbo (robotic), Jacuzzi Tracker 4X (vacuum) Pool Blaster (Buster), Two (2) PoolSkims, Solar Breeze (solar powered top skimmer) (beta to ver. 2, release date 2010), ColorSplash LED replacement bulb. Aries 550 gal separate spa, 2002 (our 3rd and BEST spa) , BBB-Bromine

  10. Back To Top    #10

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    Re: High FC Level in SWG Pool

    I also have a SWCG and lately have had to turn the dial down to 20% from 35% (running 4 hours of pump time daily). Latest test results from the shop were; CYA 38, TC 6.5,FC 6.5, PH 7.4,Adjusted total alk. 88, CH 309, Salt 3400 average water temp 63-65ยบ..I gues with low temps an 0 bather load...Chlorine is abundant...
    Inground with 7x7 spa (spillover)
    20k gal plaster (sunstone)
    pentair 3/4 hp (filter), 1 hp (spa), 1/2 hp (features)
    cartridge filter
    SWCG IC-40
    Polaris Platinum (with booster)

  11. Back To Top    #11
    Brentr's Avatar
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    Re: High FC Level in SWG Pool

    jagfan, I think this is normal. My FC has been 14 for the last month and I have my pool pump running for 2 hrs and the SWG is at 5%. We also have an enclosure and the water has been crystal clear. I still have to add a cup of muratic acid weekly as the pool is only 3-4mths old and we have a lot of aereation due to the water features.
    Last weeks tests
    FC 14.5
    CC 0
    TC 14.5
    PH 7.5
    T/A 100
    CH 375
    Temp 75
    SWG 3000

    5,775 gal, IG free form, Beach Series Antigua by Marbletite Pebble finish, 2 swim out benches, Sheer Descent, IG Fountain, Dolphin / Mermaid Statues, StaRite Dura- Glas 1.5hp pump, Hayward Pro Series Sand Filter replaced with Hayward Pro-grid DE4820, Aqua Rite SWG with T-Cell 15, Polaris 360, Pentair 300w Light upgraded to Pentair IntelliBrite (OMG what a huge difference) , Heat Siphon Heat Pump DX 5.0 109,000 btu, Pool Cage, 1800sq ft Tremron Estate Pavers, solar cover, TF-100 test kit, Pentair Deck Jet, Apollo Magnetic Stirrer (Makes testing a breeze), Aquatherm Ecosun Solar Panels 192 sq ft with GL-235 Controller,Margarita Concoction Machine,
    Pics of our Spool ( Social Pool) being built Solar install Outdoor kitchen upgrade

  12. Back To Top    #12

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    Re: High FC Level in SWG Pool

    Brentr
    My SWG is still off and today the FC is 10, so it's coming down. I've got the pump running 5 hours each day and like yours, the water is crystal clear. I think I'll try running the pump about 3 hours and see how it goes. This is my first fall/winter with the SWG and screen enclosure. I'm just amazed at how neat and clean everything looks and with so little effort. The enclosure is the best money I've ever spent on the pool.
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

  13. Back To Top    #13
    Brentr's Avatar
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    Re: High FC Level in SWG Pool

    Yes, pool screen enclosures are the best. They keep out all the leaves and grass and crawling critters Honestly we could not enjoy it especially at night when all the nats and mosqitos come out. Take a look at our Spool Build in the siganture bar
    5,775 gal, IG free form, Beach Series Antigua by Marbletite Pebble finish, 2 swim out benches, Sheer Descent, IG Fountain, Dolphin / Mermaid Statues, StaRite Dura- Glas 1.5hp pump, Hayward Pro Series Sand Filter replaced with Hayward Pro-grid DE4820, Aqua Rite SWG with T-Cell 15, Polaris 360, Pentair 300w Light upgraded to Pentair IntelliBrite (OMG what a huge difference) , Heat Siphon Heat Pump DX 5.0 109,000 btu, Pool Cage, 1800sq ft Tremron Estate Pavers, solar cover, TF-100 test kit, Pentair Deck Jet, Apollo Magnetic Stirrer (Makes testing a breeze), Aquatherm Ecosun Solar Panels 192 sq ft with GL-235 Controller,Margarita Concoction Machine,
    Pics of our Spool ( Social Pool) being built Solar install Outdoor kitchen upgrade

  14. Back To Top    #14

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    Re: High FC Level in SWG Pool

    Brentr
    Enjoyed the pics. Your pool is gorgeous! I love the pavers and extending them into the Florida room was a perfect touch.
    15x30 IG vinyl liner pool, pool cage
    Hayward S-220T high rate sand filter and Hayward super pump w/1hp motor
    Hayward SwimPure Plus SWG
    Polaris 380 cleaner and booster pump

  15. Back To Top    #15

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    Re: High FC Level in SWG Pool

    Just to follow up, last Saturday pool store reading for FC went up from 6.5 to 8.5 even though I had set me pump time to 3 hrs (from 4) and SWCG output to 20% (from 30%)....Today I just set the Intellichlor to 0% and hope to get FC down to 2-4 range...water temp 59-63 in the last 8 days....expecting lower temps this week
    Inground with 7x7 spa (spillover)
    20k gal plaster (sunstone)
    pentair 3/4 hp (filter), 1 hp (spa), 1/2 hp (features)
    cartridge filter
    SWCG IC-40
    Polaris Platinum (with booster)

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