Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 10 of 10

Thread: How much chlorine should I be adding a day?

  1. Back To Top    #1

    Join Date
    Jun 2014
    Location
    Elburn, IL
    Posts
    74

    How much chlorine should I be adding a day?

    This is my second year of owning our pool and the TFP method has been great. I am just wondering if I have been adding too much chlorine. I was reading an old thread on this topic and heard anywhere from every day to once a week. I have been adding about 1/2 a gallon of 8.25% bleach every day. My cya is about 25 so I am trying to keep my FC at 4, but I lose some during the day. I usually add my bleach at night and then by the next night I am down to 4 again. For example last night my FC was 3.5 and I added about 6 cups of bleach. This morning it was 7.5, so I didn't add any more and when I checked at 630pm my FC was 4. My ph has been between 7.5 and 7.8. When I was in the pool today, my skin seemed kind of dry ( another reason I was wondering if I have been adding too much chlorine).

    Any advice is appreciated.
    2014 13500 gal ag round Sentinelle pool 24x24x52, Hayward cartridge filter, 2.5 hp

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: How much chlorine should I be adding a day?

    Telling us cups is not as helpful as telling us the ppm you added or targeted.

    You need to daily add enough so the FC never falls below the minimum for your CYA. Raise your CYA and you will lose less to the sun.
    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!

  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: How much chlorine should I be adding a day?

    If your pool is exposed to sunlight, then your CYA level should be higher, but probably not above 50 ppm. You could raise it to 40 ppm and see how much chlorine you use (in ppm FC per day).

    Your FC/CYA ratio is higher than we recommend in the Chlorine / CYA Chart so is probably why you are noticing the effects of chlorine more.

    Generally speaking, you need to add chlorine every day (perhaps two if the pool is not in full sun) unless you have a pool cover that is mostly opaque to the UV in sunlight. In that case, you may be able to add chlorine twice a week (that's my situation, for example). Adding only once a week would not normally work well as you'd have larger swings in chlorine level so in the days after dosing you may notice chlorine's effects more and not like that. Most people on this forum add chlorine daily. It's just a simple routine and minimizes the amount of chlorine both in usage and in absolute level.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  4. Back To Top    #4

    Join Date
    Jun 2014
    Location
    Elburn, IL
    Posts
    74

    Re: How much chlorine should I be adding a day?

    I thought I might have to add more stabilizer to increase my CYA, but then I'm adding more chlorine, right? So why wouldn't I keep it where it is? Also the ppm (points per million?) is kind of hard for me to wrap my head around. Is there a place I can read more about this? I just look at pool math and it tells me oz and cups/quarts. That's why I referred to it in my post, sorry.
    2014 13500 gal ag round Sentinelle pool 24x24x52, Hayward cartridge filter, 2.5 hp

  5. Back To Top    #5
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: How much chlorine should I be adding a day?

    So what FC level are you targeting every time? That is what I want to know because then we can see how much it is dropping.

    At a higher CYA level, while the FC level might be higher, you should lose fewer ppm of FC to the sun.
    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!

  6. Back To Top    #6
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: How much chlorine should I be adding a day?

    Quote Originally Posted by New and confused View Post
    This is my second year of owning our pool and the TFP method has been great. I am just wondering if I have been adding too much chlorine. I was reading an old thread on this topic and heard anywhere from every day to once a week. I have been adding about 1/2 a gallon of 8.25% bleach every day. My cya is about 25 so I am trying to keep my FC at 4, but I lose some during the day. I usually add my bleach at night and then by the next night I am down to 4 again. For example last night my FC was 3.5 and I added about 6 cups of bleach. This morning it was 7.5, so I didn't add any more and when I checked at 630pm my FC was 4. My ph has been between 7.5 and 7.8. When I was in the pool today, my skin seemed kind of dry ( another reason I was wondering if I have been adding too much chlorine).

    Any advice is appreciated.
    Believe it or not, you're doing it right. You're adding enough bleach so that it's still above the minimum for your CYA when you add more. You're not letting it dip below too often or for too long.

    I'd suggest you run all the tests on your water. Eye irritation and dry skin are more likely from Combined Chloramines or pH out of whack than the amount of free chlorine you've been maintaining.

    It's probably time to go back to pool school for a refresher course.
    ABCs and Recommended Chemicals and Poolmath are probably the best ones to start with.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  7. Back To Top    #7

    Join Date
    Jun 2014
    Location
    Elburn, IL
    Posts
    74

    Re: How much chlorine should I be adding a day?

    Thanks Richard, I did read all 3 of those (plus a few others) just to be sure I knew what I was talking about. In response to Jblizzle - I have been targeting FC of 4, so I add more at night to counteract my loss during the day. Here are my numbers as of 645 pm today:
    FC 4
    CC 0
    ph 7.7
    CYA between 20 and 30 (last time I checked was yesterday at 700 am)
    TA 140 (as of yesterday at 700 am)
    2014 13500 gal ag round Sentinelle pool 24x24x52, Hayward cartridge filter, 2.5 hp

  8. Back To Top    #8

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: How much chlorine should I be adding a day?

    Quote Originally Posted by New and confused View Post
    I thought I might have to add more stabilizer to increase my CYA, but then I'm adding more chlorine, right? So why wouldn't I keep it where it is? Also the ppm (points per million?) is kind of hard for me to wrap my head around. Is there a place I can read more about this? I just look at pool math and it tells me oz and cups/quarts. That's why I referred to it in my post, sorry.
    You don't actually use more chlorine with a higher CYA target in spite of the higher FC minimum level, at least not for a pool exposed to lots of sun. The reason is that CYA shields chlorine from breakdown (in addition to binding to it) and that effect is so strong that one would lose less absolute FC with 4 ppm FC and 50 ppm CYA than they would with 2 ppm FC and 25 ppm CYA. Of course, as you point out you need to add more than being at the minimum so that you end up at the minimum the next day, but you will lose less FC at higher CYA levels.

    You say you are targeting a minimum FC of 4 ppm with your CYA of 25 ppm but PoolMath says for that CYA that the FC Goal is "2 to 6" assuming you set "suggested goal levels from:" to "troublefreepool.com" and set "Primary source of chlorine:" to "Bleach". So even with the larger swings you have due to losing more from sunlight you're on the higher side of that range. If you had a higher CYA level, say for example 40 ppm, then you might go from 5 to 3 or if you were at 50 ppm CYA you might go from 6 to 4 (and you may lose less than this amount). Though this sounds about as high as your current situation, it isn't in terms of effects on your swimsuits, skin, and hair because the active chlorine in the water is proportional to the FC/CYA ratio (see the Chlorine / CYA Chart). So today you have a minimum you have set of around 4/25 while what I am describing has a minimum of 3/40 or 4/50 which is half the active chlorine you have now but is still at or above the minimum needed to prevent algae from growing.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  9. Back To Top    #9
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    8,997

    Re: How much chlorine should I be adding a day?

    That "target" number is arbitrary given varying pool conditions. "target" whatever number you lose in ppm of FC daily to stay above your minimum for your given level of CYA. I'd get that CYA level to 40 or 50.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  10. Back To Top    #10

    Join Date
    Jun 2014
    Location
    Elburn, IL
    Posts
    74

    Re: How much chlorine should I be adding a day?

    Thanks everyone. I'm going to get more stabilizer today and will get back to you when my cya is 40.
    2014 13500 gal ag round Sentinelle pool 24x24x52, Hayward cartridge filter, 2.5 hp

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •