Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: How much bleach will I need - per week/month/season??

  1. Back To Top    #1

    How much bleach will I need - per week/month/season??

    I'm going to try the BBB method this year. I have a large pool - 21x41x54" pool - if I use, say, 6% WM bleach, how many bottles do you think I'll need? We don't have a WM here, so I can't just pop in and get some whenever I want, so I'll need to plan ahead.. and storage - how would I store that much? Obviously not in the pool house, right??

    And the baking soda - I saw big bags in the pool section of Walmart - how many of those (at like $6.xx) would I need, do you think?

    Thanks for the planning help!
    21x41x54" AG Artesian Seville II
    Installed around 2004 - we moved here in 2008
    23,000 gal
    Hayward SwimPro 256T Sand Filter
    1HP 2speed Hayward Power Flo Matrix
    (and have 2HP Hayward Swimpro and a 2hp 2speed Waterway Hi-Flo pump as back up also!! lol)
    No heating - other than Solar SunRings
    Central IL

  2. Back To Top    #2

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: How much bleach will I need - per week/month/season??

    Bleach will lose its potency over time, especially if you store it someplace that gets really warm. So you don't want to stock up for the whole season. Offhand I don't remember how fast it goes, hopefully somebody will come along who knows where to find that info.

    I can't remember ever using baking soda, my TA is always too high. Whether you'll need it depends on what your water is like.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,085

    Re: How much bleach will I need - per week/month/season??

    The chart at the bottom of this link will give you some idea of the half-life of various strengths of chlorinating liquid or bleach at various temperatures. 6% bleach will last many months unless the temps are really hot. At room temperature, you can keep it for an entire season with only some loss. It's 10% and 12.5% chlorinating liquid that is more of an issue in terms of only lasting a month or two in terms of noticeably losing its potency unless kept cooler. This also assumes a quality product.

    At 29,000 gallons, your pool is indeed large. As for chlorine usage, that depends a lot on whether you have a pool cover. I'd strongly suggest one as it will significantly cut down your chlorine usage. It will also significantly cut down evaporation and water usage from refill which increases Total Alkalinity (TA) and Calcium Hardness (CH).

    Every 1 ppm FC per day chlorine usage would require for every month around 14 gallons of 6% bleach (that's about 19 3/4-gallon jugs or 9 1.5-gallon jugs). With a pool cover, you can usually expect < 1 ppm FC per day chlorine usage. Without a pool cover, figure on 2-3 ppm FC per day usage, depending on the amount of sun on your pool and the Cyanuric Acid (CYA) level. It's possible with 6 ppm FC and 80 ppm CYA that you might use closer to 1 ppm FC per day if you are lucky.

    You might seriously consider getting some sort of saltwater chlorine generator (SWG) for your pool. Otherwise, you're going to be hauling an awful lot of bleach. It's possible that 50 ppm Borates in your pool would slightly cut down the chlorine usage and also let you maintain a somewhat lower FC level, but we don't have a lot of experience with this (I'm very happy with the Borates in my own pool that have appeared to cut down chlorine usage from 1 ppm FC to 0.8 ppm FC and that's with a pool cover).

    Richard
    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
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: How much bleach will I need - per week/month/season??

    Ditto on the baking soda - I've not had to add any in more than 2 years, the TA is rock solid.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  5. Back To Top    #5
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: How much bleach will I need - per week/month/season??

    A pool typically uses around 2 ppm of chlorine per day during the summer. Less chlorine is required in the spring and fall. And, of course, every pool is different. Your pool might use more or less chlorine than that.
    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

  6. Back To Top    #6

    Re: How much bleach will I need - per week/month/season??

    i use about 4ppm/day...full sun..no cover...sky high bathing load...had the WHOLE baseball team of 7 and 8 years olds tonight...
    25,000 gal IG Utopia pool/Raypack gas heater/BBB

  7. Back To Top    #7

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: How much bleach will I need - per week/month/season??

    On the other hand, with a solar cover and nobody using it except weekends, I'm losing around 0.5ppm per day. I expect that to go up after school gets out.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

Posting Permissions

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