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Thread: Rule of thumb on liquid chlorine

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    Rule of thumb on liquid chlorine

    This summer I switched to liquid chlorine - I pour the 1 gallon 5% concentrate from the dollar store once weekly, 3 gallons if shocking is needed. I have liked the less vacuuming, etc. I want to try Minyards stores, has a deal for 1 gallon 12.5% strength for $2.99. Pool is 15k gallons, used about once/twice fortnightly by 2 people, location is Texas. I am wondering what is the general rule of thumb for the amount to pour for both 12.5% and 5% concentrations, how often and what summer, winter variations if any?
    15K Gallons, Oval/Kidney shaped In Ground Plaster, 6.5 ft Deep, Pentair DE Filter - Nautilus 48, 1/2HP Pump and 1/2 Polaris Pump

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    Mod Squad Jimrahbe's Avatar
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    Re: Rule of thumb on liquid chlorine

    Jay,

    The whole point behind the TFP process is measuring your pool water, and then, using that data and "Pool Math", determining what action needs to happen and how much of what chemical, to add.

    Unless you know where you are now... it is hard to determine where you need to go or when you get there.

    Pool Math (Link at top of this page)..

    What test kit are you currently using to test your water?

    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 Calder Spa.

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    Re: Rule of thumb on liquid chlorine

    I will check the test kit but I generally take the water to Leslies store. I had it taken today, I will post the results later when I get home.
    15K Gallons, Oval/Kidney shaped In Ground Plaster, 6.5 ft Deep, Pentair DE Filter - Nautilus 48, 1/2HP Pump and 1/2 Polaris Pump

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    JoyfulNoise's Avatar
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    Re: Rule of thumb on liquid chlorine

    A full gallon of 5% chlorine bleach in your pool adds, at most, 4ppm FC. Considering most pools consume about 2-4ppm per day due to sunlight loss, your pool would have zero FC in it for most of the time between chlorine additions or simply be maintaining what ever low level of FC there is. Without accurately knowing your stabilizer levels (CYA), there is no way to know if this amount of chlorine is sufficient. This would leave your pool open to algae blooms and poor water quality. As well, there is no reason to "shock" a pool regularly if you follow the methods taught here. TFP does not operate on "rules of thumb's" here...that is what the pool industry uses. TFP operates on exact and specific information that is obtained by using a professional grade test kit. All of the chemical additions to pool water should be based on solid information, not guesswork.

    Adding liquid chlorine only is certainly the right way to go BUT, as Jim said, if you are not regularly testing your water then you really have no idea what is in it and how much chlorine, if any, to add.

    Your next step should be ordering one of the high quality, professional test kits that are recommended by this site (you can get them from many different vendors online) and learning how to use that to guide your pool care decisions. While it may seem burdensome at first to constantly test and adjust your water chemistry, in the long run it saves time and money. Leaving chemical additions up to guesswork is a recipe for a green & cloudy pool with lots of time wasted on trying to get it under control again.
    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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    Frankhugus's Avatar
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    Feb 2016
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    Danville, CA
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    Re: Rule of thumb on liquid chlorine

    Quote Originally Posted by JoyfulNoise View Post
    A full gallon of 5% chlorine bleach in your pool adds, at most, 4ppm FC. Considering most pools consume about 2-4ppm per day due to sunlight loss, your pool would have zero FC in it for most of the time between chlorine additions or simply be maintaining what ever low level of FC there is. Without accurately knowing your stabilizer levels (CYA), there is no way to know if this amount of chlorine is sufficient. This would leave your pool open to algae blooms and poor water quality. As well, there is no reason to "shock" a pool regularly if you follow the methods taught here. TFP does not operate on "rules of thumb's" here...that is what the pool industry uses. TFP operates on exact and specific information that is obtained by using a professional grade test kit. All of the chemical additions to pool water should be based on solid information, not guesswork.

    Adding liquid chlorine only is certainly the right way to go BUT, as Jim said, if you are not regularly testing your water then you really have no idea what is in it and how much chlorine, if any, to add.

    Your next step should be ordering one of the high quality, professional test kits that are recommended by this site (you can get them from many different vendors online) and learning how to use that to guide your pool care decisions. While it may seem burdensome at first to constantly test and adjust your water chemistry, in the long run it saves time and money. Leaving chemical additions up to guesswork is a recipe for a green & cloudy pool with lots of time wasted on trying to get it under control again.
    Great post and if you follow, life will be good.
    14,000 Gal, InGround, Spa Attached, Satin-Matrix Northshore Tahoe Pebble-Tec, Remodel 6/15, Taylor K-2006 Kit, Pentair IntelliFlo Variable Speed Pump, Polaris 280 Sweep, Jandy CL460 Cartridge Filter, Solar Heated. Taylor K-2006 Test Kit

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    kellyfair's Avatar
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    Jun 2016
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    Re: Rule of thumb on liquid chlorine

    And Jay, testing your own pool is quick and FUN, and you will be able to keep your water balanced and safe, meaning you spend more time in your pool and less time on it. Trust us, get the test kit and let's mad scientist this thing!
    Kelly, Tampa FL
    15' by 4' Intex above ground metal frame, about 5300 gallons
    Intex 120V Krystal Clear Sand Filter Pump & Saltwater System CG-28679 with E.C.O.
    TF100 Kit and Speedstir
    Intex Auto Cleaner - works great!

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    Re: Rule of thumb on liquid chlorine

    After some reading on here I have now realized that I need a new knoweledge based on TFP if I am going to have a TFP.
    @kellyfair "mad scientist this thing" sounds like great fun so I am getting a kit so that I can take my pool back (yeah from the throws of the local pool store that is)

    Before the kit gets here I had the water tested today at a local pool shop, here are the numbers.

    RESULTS ...................................POOL Store balanced levels
    ----------- -----------------------------------------------------------
    Chlorine - 5 ...............................1-3 ppm
    PH - 8.0 ....................................7.4-7.8
    Total Alkalinity - 40......................80-120 ppm
    Stabilizer - 70 .............................30-60 ppm
    Calcium Hardness - 690.................200-500 ppm

    Where do I need to go?

    P/S
    I am also curious to know any opinion/s if the pool store balanced levels are proper targets?
    15K Gallons, Oval/Kidney shaped In Ground Plaster, 6.5 ft Deep, Pentair DE Filter - Nautilus 48, 1/2HP Pump and 1/2 Polaris Pump

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    Mr Bruce's Avatar
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    Re: Rule of thumb on liquid chlorine

    I would add a half gallon of bleach everyday until the pool kit arrives. Pool store testing is useless.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: Rule of thumb on liquid chlorine

    Is this the recommended test kit ? TF-100 Start Up? When I put this on Amazon I am only getting a lot of Taylor Technologies stuff and I am getting confused because none looks like this->Water Testing - TFTestkit TF-100 Seven Test Kit - TF-100
    15K Gallons, Oval/Kidney shaped In Ground Plaster, 6.5 ft Deep, Pentair DE Filter - Nautilus 48, 1/2HP Pump and 1/2 Polaris Pump

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    mickey4paws's Avatar
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    Apr 2009
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    S.E. MI
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    Re: Rule of thumb on liquid chlorine

    Go here: TFTestkits.net Oops, hit send too soon: Try this: TFTestkits.net

    I would highly recommend the Speedstir which is included in this option, or you can uncheck it if you don't want it. But I think you'll like how much easier it makes testing.
    IG 12' x 39' - 20k Gallons - Vinyl Lined - StaRite Cristal-Flo II 26" Sand Filter - Hayward SuperPump 1 hp - Dolphin Dynamic autocleaner - Lochinvar Energyrite gas heater - Aqua Rite SWCG T-15 - TF100 Test Kit - Skimlite Duallly 9016 pole (great pole)

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