Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: Minimizing Daily Chlorine Usage

  1. Back To Top    #1

    Minimizing Daily Chlorine Usage

    Basically, I'm trying to minimize my daily chlorine usage. My goal is to get to the point where I have to replace 1ppm a day at most. I prefer to hold my CYA stead by using unstabilized chlorine.

    Does stabilized chlorine (dichlor) for some reason last inherently longer than unstabilized chlorine (bleach)?
    Is there some way I can calculate the required amount of CYA to limit daily chlorine usage to 1ppm?
    Are there any simple ways to reduce chlorine burn off?

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    8,997

    Re: Minimizing Daily Chlorine Usage

    I think you're chasing a winged purple dragon at 1 ppm per day.
    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!

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,337

    Re: Minimizing Daily Chlorine Usage

    Why do you want to get to 1ppm or less?

    You can construct a building around your pool and that'll cut out a lot of loss. I'm not sure you can get to 1 ppm per day every day but it'll probably get close. Oh yeah you can't let anyone swim in it either.

    One type chlorine doesn't last any longer than any other type.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4

    Re: Minimizing Daily Chlorine Usage

    That makes me a sad panda. What is feasible for an outdoor in-ground pool? For me raising the chlorine levels by 1ppm is 1 gallon of 12% bleach and it's $20 for 5 gallons of 12% bleach. So it gets expensive

  5. Back To Top    #5
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,337

    Re: Minimizing Daily Chlorine Usage

    That must be one huge pool! I get 100,000+ gallons in order for it to take 1 gallon of 12% to raise the FC by 1ppm.

    2ppm is very obtainable. I do that with a CYA of about 60 ppm.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  6. Back To Top    #6

    Re: Minimizing Daily Chlorine Usage

    I don't know the exact number of gallons but I'm reasonably sure it's between 90 and 100. Unfortunately, I had some equipment issues (that you helped me with) and I didn't get my filtration system going until yesterday. While it was broken, the pool went green. I put 10lbs of dichlor in last night and it was all gone this morning. Probably lost it all to the algae and it's still green. Going to liquid shock it Saturday night and go through my 40lbs supply of dichlor today and tomorrow.

  7. Back To Top    #7

    Join Date
    Oct 2010
    Location
    Houston, TX
    Posts
    152

    Re: Minimizing Daily Chlorine Usage

    You might not want to use dichlor when shocking unless your CYA is really low, as it'll raise CYA forcing you to use more liquid shock or chlorine. What is your CYA level?
    15k gunite pool. Intelliflo VF. Autopilot SWG.
    2k separate spa with waterfall (ie: pain in the rear maintaining a separate body of water). 2HP Hayward Tristar pump.

  8. Back To Top    #8
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Minimizing Daily Chlorine Usage

    beezar, see this related topic.

    vik, best to be more careful to keep your comments related to the current topic so this kind of confusion doesn't occur.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  9. Back To Top    #9

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

    Re: Minimizing Daily Chlorine Usage

    Higher CYA levels will protect chlorine more from sunlight even with proportionately higher FC levels. For example, 6 ppm FC with 80 ppm CYA may lose somewhat under 1.5 ppm FC while 7.5 ppm FC with 100 ppm CYA may lose around 1.2 ppm FC. However, such high CYA levels are risky because if you let the chlorine get too low for too long or have any unusual event that requires you to shock the pool, then it will take extraordinarily high levels of chlorine for such shocking. We usually recommend around 50 ppm CYA as a reasonable compromise, but daily chlorine demand may be around 2 ppm FC at this CYA level and you'll need to add chlorine every day.

    One way to minimize chlorine usage is to use a mostly opaque pool cover. That will usually get you to under 1 ppm FC loss per day where the loss is mostly related to the water temperature. Of course, with such a large pool that may be impractical unless the cover is automatic or you have some sort of enclosure. Another way is to use alternative means of controlling algae growth, but that usually costs extra either in mostly one-time dosing as with borates or in weekly addition as with PolyQuat 60. Another way to potentially lower cost is to use a saltwater chlorine generator -- though they normally aren't that much less expensive, they pay off more in larger pools since the chemical costs go up faster than the capital costs for that size of pool and the electricity cost to generate the chlorine isn't very much at all, but initial costs will be high for both equipment and salt.

    Why is your pool so large? Is this a residential pool?
    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"

  10. Back To Top    #10

    Re: Minimizing Daily Chlorine Usage

    Sorry Jason, I'll try to stay on topic. The reason I mentioned that I was using dichlor was that it would raise my CYA up but I did get off topic at the end there.

    chem geek:
    My pool is residential. I would love to have a SWG. However, we're planning to move out soon and this season is half done. If I could find one that's cost effective when taking into account that this is probably my last season tending this pool, I would 100% go for it. However, the cheapest solution I've been able to find is $2000 at least not including installation.

  11. Back To Top    #11

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

    Re: Minimizing Daily Chlorine Usage

    Well, with 100,000 gallons, nothing is cheap.

    For 2 ppm FC you need 4.3 96-ounce jugs of 6% bleach or 1.6 gallons of 12.5% chlorinating liquid. Prices vary, but at $1.25 for 96-ounce bleach or $3.50 for 1 gallon of chlorinating liquid this is around $5.40 to $5.60 per day or around $165 per month.

    For 10 ppm CYA you need 8.3 pounds which at $3.26 per pound is $27 so to go from 50 ppm to 80 ppm is over $80 in order to save perhaps 0.5 ppm FC per day or around $40 per month.

    For PolyQuat algaecide you need 90 ounces initial and then 30 ounces per week which at $20 per quart (32 ounces) is $56 initial plus $19 per week (about $80 per month) to save at least 1 ppm FC per day or around $80 per month so close to a wash unless you go to aggressively low FC/CYA ratios such as 2 ppm FC with 80 ppm CYA in which case you have a net $40 per month savings.

    For 50 ppm Borates you need 239 pounds of boric acid which at $1.62 per pound is $387. Using 20 Mule Team Borax and Muriatic Acid would be less expensive, but still well over $200. This would also be to save perhaps $80 per month at best.

    The fact is that a large pool is proportionately more expensive to maintain.
    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"

  12. Back To Top    #12
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Minimizing Daily Chlorine Usage

    You can reduce chlorine usage to zero this way..















    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!

Posting Permissions

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