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Thread: Newbie Question About FC

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    Join Date
    Aug 2016
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    Manorville, NY
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    Newbie Question About FC

    Hello everyone so I installed and had my pool last year and did everything with salt and the SWG, however I am about 2 months from opening my pool ow and starting to read up and have my TF-100 test kit now so just trying to understand it.

    In order to add FC you just use bleach, excuse my ignorance, but even in SWGs? Last year I would typically go to the pool store have them test it and at the end of it I would dump quite a bit of salt into the deep end to raise get everything right. From what I understand I can just dump liquid bleach into the pool to get the FC levels once I test, even though it is a salt water pool. I know this is probably an extremely stupid question, but have to start somewhere.

    Also is the end result so that I am just adding bleach and keeping other things leveled and never really "boosting" my production from the SWG?
    30,600 gallon SW Liner IG, 26'x46', 8' deep end, Hayward Cartridge Filter (Model C4030), Aquacal Heat Pump (Model R410A) with Autopilot PPC1 Salt Cell, Hayward Max-Flo VS (x2, 1 for pool, 1 for waterfall), Autopilot Salt Chlorine Generator (Pool Pilot Digital Model 75003), Hayward Colorlogic x3, AquaClean Robot, and SolarBreeze NX, TF-100 Test Kit

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    TheBraLady's Avatar
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    Jun 2015
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    Concord, NC
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    Re: Newbie Question About FC

    Good morning!

    Not stupid at all!! I have a SWG as well and in the colder temps you have to manually add chlorine because the cell doesn't work. I *think* the temp required is around 60 . I keep our pool open year round and so in the winter have had to add plain bleach just a handful of times.

    Adding salt to the pool doesn't directly increase the FC level - it gives the salt cell something to work with to make the FC.

    I'm sure somebody much more expert will be along shortly to help you, but I just happened to see this and wanted to assure you it was not a stupid question.

    Keep up the learning here. It's a terrific source of support and information. Do you know how to use Pool Math? You will need to know your CYA first, and then the chart will tell you what to target for your FC.

    Hope this helps until the experts come along.
    Pool Completed 8/2015 18'x36' Gemini shape 3.5' - 8', 19,200 gal IG vinyl, Hayward Max-Flo 1.5 HP 2-speed pump, Hayward Pro Series 300-lb sand filter, Hayward AquaPlus SWG, NO Autofill, Dolphin M400 robot, Taylor 2005 test kit, 434 gal Bullfrog A7L spa

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    Aug 2016
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    Re: Newbie Question About FC

    Yes just starting to learn. I close mine or my Labrador would jump into it during the middle of the winter and I'm in no mood to chase after her. Looking forward to understanding this a bit better thank you


    30,600 gallon SW Liner IG, 26'x46', 8' deep end, Hayward Cartridge Filter (Model C4030), Aquacal Heat Pump (Model R410A) with Autopilot PPC1 Salt Cell, Hayward Max-Flo VS (x2, 1 for pool, 1 for waterfall), Autopilot Salt Chlorine Generator (Pool Pilot Digital Model 75003), Hayward Colorlogic x3, AquaClean Robot, and SolarBreeze NX, TF-100 Test Kit

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    Mod Squad Jimrahbe's Avatar
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    Jul 2014
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    Bedford, TX
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    Re: Newbie Question About FC

    Manor,

    Welcome to TFP... A Great resource for all your saltwater pool questions...

    Just to make sure we are all on the same page... Your SWCG uses the saltwater to make chlorine. In the summer months you should not have to use bleach unless your SWCG can't keep up with the amount of FC (chlorine) that your pool uses each day.

    At the beginning of the season, before you turn the SWCG on for the first time, if you find that you have very little chlorine left in the pool, it is easier on the SWCG to bring the FC level up by using Liquid Chlorine or bleach. After your FC is close to where you want it, then turn your SWCG back on.

    You will still have to make sure that the salt level in your pool is correct by testing yourself or going to the pool store. I would not rely on any of their other tests, but they do pretty well on salt testing. Also, your SWCG should report the amount of salt it sees in the pool water.

    Using the SWCG's "boost" mode just uses up the total amount of chlorine that a cell can produce in its lifetime. I never use the boost mode for any reason.

    Thanks for posting a great question...

    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 Caldera Spa.

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    TFP Guide

    Jezza's Avatar
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    Jan 2015
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    Bunbury, WA, Australia
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    948

    Re: Newbie Question About FC

    Yep a SWG is like a mini-chlorine making factory. It turns the salt into chlorine through electrolysis. Whether you use a SWG to make chlorine or add it manually through bleach or other chemicals, the end result is the same- chlorine.

    The amount of chlorine added by a SWG is relative to the pump run-time and output setting and it good at adding chlorine gradually albeit in smaller amounts. You can add bleach or liquid chlorine to supplement the SWG and many people add a dose here or there, especially when it gets hot and/or you have a heavy bather load.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

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    Manorville, NY
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    Re: Newbie Question About FC

    Thanks again for the answer guys that makes a lot of sense.
    30,600 gallon SW Liner IG, 26'x46', 8' deep end, Hayward Cartridge Filter (Model C4030), Aquacal Heat Pump (Model R410A) with Autopilot PPC1 Salt Cell, Hayward Max-Flo VS (x2, 1 for pool, 1 for waterfall), Autopilot Salt Chlorine Generator (Pool Pilot Digital Model 75003), Hayward Colorlogic x3, AquaClean Robot, and SolarBreeze NX, TF-100 Test Kit

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