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Thread: Green High FC

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    Join Date
    Aug 2016
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    Green High FC

    Hi everyone,

    We had a swamp and now have high FC and the green isn't going away. Vinyl, SWCG, Sand + Added DE.

    Readings:
    FC: 45+
    CC: 0-0.5
    pH: 7.6 (although with FC this high it's hard to actually tell)
    TA: 100
    CH: 60
    CYA: 45
    Salt: 3500

    My FC has been this high for over a week with no improvement. I can see to the bottom of the deep end and the pool is more of a minty green then dark green, but clear not cloudy. We've brushed and brushed, and have a robot brushing when we aren't manually brushing. I handled the pool last year and I'm at a loss this year. Week 1: black to dark green. Week 2: Dark green to Minty green. Now were are going on week 4 with no change in almost 2 weeks. Any ideas?
    18 x 36 x 8 Vinyl Pool, Hayward Sand Filter, Hayward T-15 SWCG, K-2006, 2017 Dolphin Nautilus CC

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    Mod Squad Texas Splash's Avatar
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    Re: Green High FC

    First thing I would recommend is shut down any source of chlorine right away. If the SWG is on, turn it off or set to zero. The FC is way too high, and as you may already know double the SLAM requirement. That's the first order of business. Once the FC returns to your SLAM level of about 20, I'd like to know if your water color changes. Do you know if you have any iron in the water locally? I have a feeling the change in "green" might be iron related (perhaps copper), but we'll see. Check back with us once the FC has had a chance to cool-off a bit.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Green High FC

    Quote Originally Posted by Texas Splash View Post
    First thing I would recommend is shut down any source of chlorine right away. If the SWG is on, turn it off or set to zero. The FC is way too high, and as you may already know double the SLAM requirement. That's the first order of business. Once the FC returns to your SLAM level of about 20, I'd like to know if your water color changes. Do you know if you have any iron in the water locally? I have a feeling the change in "green" might be iron related (perhaps copper), but we'll see. Check back with us once the FC has had a chance to cool-off a bit.
    I'll give it a couple of days and see where we stand. We had to do a big drain and refill last year (over 15,000 gallons from previous owners cya levels) but was clear all last year. Our city water tests show 0.12ppm copper and 0.07ppm iron, both below national averages.

    18 x 36 x 8 Vinyl Pool, Hayward Sand Filter, Hayward T-15 SWCG, K-2006, 2017 Dolphin Nautilus CC

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    Mod Squad Texas Splash's Avatar
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    Re: Green High FC

    Our city water tests show 0.12ppm copper and 0.07ppm iron, both below national averages.
    I'm not surprised, but I also suspect the extremely high FC level helped to "anger" that minimal amount of metal causing some of what you see today. I'm optimistic the color will change a bit once the FC falls. While it is that high though, take advantage of it by scrubbing/sweeping the entire pool each day, to include any hidden areas (hollow steps, ladders, behind the pool light if there's a niche, etc. Then was once it does fall back down to the 20 zone, you might be able to try an overnight (OCLT) test.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Green High FC

    Has definitely cleared up. Not crystal clear but only a slight tinge of green. Definitely improved. FC is back down to around 22.

    18 x 36 x 8 Vinyl Pool, Hayward Sand Filter, Hayward T-15 SWCG, K-2006, 2017 Dolphin Nautilus CC

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    Mod Squad jblizzle's Avatar
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    Re: Green High FC

    How/why did the FC get so high? Did you not use PoolMath to know how much to add?
    That can certainly be damaging to your liner.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: Green High FC

    After 2.5 weeks of being at 1.0-1.25x shock level and no improvement I got desperate and went 2x to see if there was an improvement.

    18 x 36 x 8 Vinyl Pool, Hayward Sand Filter, Hayward T-15 SWCG, K-2006, 2017 Dolphin Nautilus CC

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    Mod Squad jblizzle's Avatar
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    Re: Green High FC

    Quote Originally Posted by Sigmabond View Post
    After 2.5 weeks of being at 1.0-1.25x shock level and no improvement I got desperate and went 2x to see if there was an improvement.
    That is clearly no where in our recommended procedures
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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