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Thread: question about FC target level

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    question about FC target level

    Hi, my CYA level is 40 and target FC level is 5, my question is should I get FC level to 5 in the evening so it won't get below 3 during the day or higher than 5 in the evening ?

    thanks Dave
    16x36 free form gunite, 8' deep end, raised spa attached, 18,000 Gallons, Stone Scape mini pebble, remodeled 8/10/2015, Pentair variable speed pump #011018, DE filter, Pentair Easy Touch upgrade automation w/ screen logic, Pentair 520549 Easy Touch indoor control panel, is4 spa side remote, Pentair Mini Max plus 400 heater, Hayward Navigator pool vac, IntelliBrite 5G color LED light in pool and spa

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    Mod Squad tim5055's Avatar
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    Re: question about FC target level

    The key number is a minimum of 3ppm FC for 40 CYA. The target is there to keep you above 3 all the time. Every pool is a little different so the target can be adjusted as you watch how your pool reacts.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Texas Splash's Avatar
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    Re: question about FC target level

    Hi Dave. For our non-SWG pools, adding chlorine manually is usually accomplished once a day. As Tim noted, we NEVER want to fall below the minimum recommended level, so it's not uncommon for some owners to "flex" their target by 1-2 ppm so that their FC hovers right around the TFP target throughout the day. Remember to allow for normal daily consumption of 2-4 ppm so that you don't ever go below your assigned minimum level. As for when to add the bleach, it's a personal thing really. For many it's based on their schedule. I do mine in the evening out of convenience, but many add bleach in the AM with great results as well.
    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: question about FC target level

    thank you
    16x36 free form gunite, 8' deep end, raised spa attached, 18,000 Gallons, Stone Scape mini pebble, remodeled 8/10/2015, Pentair variable speed pump #011018, DE filter, Pentair Easy Touch upgrade automation w/ screen logic, Pentair 520549 Easy Touch indoor control panel, is4 spa side remote, Pentair Mini Max plus 400 heater, Hayward Navigator pool vac, IntelliBrite 5G color LED light in pool and spa

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    JoyfulNoise's Avatar
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    Re: question about FC target level

    You should try to figure out what your day time loss of FC is. That will determine where your target level should be kept (Target FC = Min FC + daytime FC loss). If the loss rate to daytime UV gets high enough, you can reduce it by increasing your CYA but you will need to increase your min FC to maintain the recommended FC/CYA ratio for your pool.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: question about FC target level

    David,

    Here are a couple of other things to consider in your target FC = 5, CYA of 40 and min FC = 3. [note, anyone of the above can critique my points bc now I've done a lot of reading and could be dangerous]

    1. How much sun does your pool receive? Does the house block it in the morning, afternoon or neither? The more sun, the more consumption of CL, so adding at night does not use CL
    2. Do you have trees around or anything else that puts organics into the pool, esp if it's windy. The more organics, the more consumption of CL..wind usually blows more in the day, so more chance of leaves in your pool during the day. - also, if your skimmer bowls are full w leaves, remove them ASAP...
    3. How does your pool get CL and what type is it? Any of the tablets or non liquid Chlorines [di-trichlor's ] add CYA to your pool, thus inevitably it will take more CL to protect your water as noted by Matt above.
    4. water temps - the cooler the water, the less CL used, also, the higher the pool activity or spa used and water heated, the greater the usage of CL

    Every pool/surroundings/environment elements are diff...you need to consider all of the above and build that into your target FC, thus impacting your Min FC.

    Regards, tstex
    InGround 15K gal, 18'x30' 3.5' to 5.5' depth w/ 9'x9' spillover Spa, Pebblesheen w/ Travertine, Hayward 3 HP VSP, Hayward C4030 Cartridge, Hayward 1.5 HP for 2 Scupper columns, ProLogic, PL-PS-8 Panel, Hayward 400K BTU Heater, 3 ColorLogic LED, Spa Blower, TF-100 w S-Stick, QC Tiger Shark, Autofill

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