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Thread: Target FC for SWG - Pool School Recommendation or PoolMath?

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    Target FC for SWG - Pool School Recommendation or PoolMath?

    Trying to figure my FC goal:
    SWG 70 for CYA

    recommendation according to Pool School at http://www.troublefreepool.com/conte...art-slam-shock

    CYA (Stabilizer) 70
    Minimum FC 3
    Target FC 5


    However, if I use Pool Math, set for SWG, Plaster, it recommends:
    CYA (Stabilizer) 70
    Minimum FC 3
    Lower Target FC 8
    Upper Target FC 10

    Which target should I be using? I had always been using the Pool School Target of 5, but noticed PoolMath is recommending 8-10. Has something changed?
    6640 gallon outdoor in-ground 8x26 pebble pool, 3'-5' deep, Pentair IntelliFlo Variable Speed pump, Jandy CL580 Cartridge Filter, Jandy AquaPure 1400 SWCG

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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    I notice that changing the Pool Math from SWG to Bleach or anything else for that matter does not change the Target Range, so probably a problem with PoolMath.

    I think I am going to follow Pool School recommendation of 5 FC, unless I hear that there has indeed been new thinking on this.
    6640 gallon outdoor in-ground 8x26 pebble pool, 3'-5' deep, Pentair IntelliFlo Variable Speed pump, Jandy CL580 Cartridge Filter, Jandy AquaPure 1400 SWCG

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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    The main thing is you just don't want to go below the minimum level at any time. Targeting 5 will most likely ensure that the level will not drop below 3 anytime during the day.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    The guidelines on TFP are developed and modified slowly as anecdotal evidence from members' reports is ultimately the best way to set standards.

    Because of this, our guidelines are a bit fluid and you will find some suggested levels that don't match perfectly.

    In every case, either level is fine. Pool chemistry is not a black and white issue wherein your arms and legs fall off if your pool chemistry is not PERFECT in every regard. It's important to learn the ranges and the possible results if your pool drifts outside those ranges.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad kimkats's Avatar
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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    Each pool is SO different. It is best to keep a journal of your test results so you can see what works best. Do you have FC at the end of the day? If no then you need it higher to start with. If too much FC then you need to lower it. As Dave says it is fluid so it can fit many pools.

    Great question!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    Quote Originally Posted by kimkats View Post
    Each pool is SO different. It is best to keep a journal of your test results so you can see what works best. Do you have FC at the end of the day? If no then you need it higher to start with. If too much FC then you need to lower it. As Dave says it is fluid so it can fit many pools.

    Great question!

    Kim
    I have always kept my FC in 5.0 -6.0 range since I run the cell during sunlight hours and FC doesn't go up and down as long as cell is at right level. But pool math says I should be keeping it at least 8? It seems it will be hard for my cell to keep it that high, so should I lower the CYA and ignore the SWG vs bleach model that was put forward in Pool School and just use the bleach table?

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    Mod Squad kimkats's Avatar
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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    How does your water look? Do you ever have problems with algae or cloudy water? In there is your answer!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Administrator Leebo's Avatar
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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    One issue with PoolMath is that we have to create one form to fit all pools. As you can see here it can become confusing trying to include all the information to fill all the different scenarios.
    PoolMath.jpg

    Above is a screenshot of PoolMath for your CYA level of 70ppm. As you can see in the very first box you're given the "SWG Minimum" of 3 which matches Pool School. Go with that number as the one you do NOT want to allow it to go below. The reason we suggest 5ppm in Pool School is it's a good target to help make sure your levels are always above 3ppm. The 8-10 comes into play when you are not using a SWG as those levels are higher. Ignore that box unless you dose manually with Liquid Chlorine.......it's simply there to fill different scenarios.

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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    Wait, the Daily Target in PoolMath is intended for non-SWG pools? Can I suggest we add a statement in there, as I have been confused on this point.
    24'x54" Nakoma resin above ground pool (13500 gal.), Hayward Aqua Trol RJ SWG with T-Cell-5, Hayward 1.5 HP pump with 19" sand filter, Hayward Elite light, installed June 2017

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    Mod Squad jblizzle's Avatar
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    Re: Target FC for SWG - Pool School Recommendation or PoolMath?

    I think I could make this more clear with a very simple fix if you like Lee. Seems this question keeps coming up.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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