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Thread: How much Chlorine/Bleach is normal usage?

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    How much Chlorine/Bleach is normal usage?

    I live in Houston, TX. So its getting hot out ~95 F this week.

    Pool - plaster lined, 18,000 gals, use ~3/week

    I'm using the BBB method (well, no Borate yet). I use a Taylor 2006 test kit. CYA ~45-50

    I'm using 10% bleach, ~$3 gallon. I'm going through a gallon every 1-2 days. That seems high? How much bleach is 'normal' usage?
    Houston Texas - 18 k gals pool, Hayward 2 HP main pump, 0.75 hp boost pump, 2 HP waterfall pump, Hayward H400 idl Heater, DE filter
    Polaris 280 pool bot - Taylor 2006 Test Kit - BB (no Borax yet)

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    Re: How much Chlorine/Bleach is normal usage?

    Seems about right to me. My DW takes care of ours and we use 8%. She says about 1/2 jug per day. BTW, she doesn't like the 10%. Says it doesn't work as well. I think it may not be as "fresh".
    16 x 32 15300 gal. IG Vinyl Jandy pump, Jandy sand filter, Paramount circulation system, Automatic pool cover.

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    JasonLion's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    That seems high to me. There are several possibilities. Could you post a complete set of water test results? Also, what do you raise FC to when you add chlorine?
    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

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    y_not's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    That much huh? Granted my pool is 5x smaller than yours HoleInOne, but I use about a cup per day of 8.25% bleach. Times 5 to equal the same size pool as yours and that gets you a little over 1/4 of a gallon per day. That's at a CYA of 30.

    But it seems logical that the larger the pool surface area, the more chlorine the sun has a chance to burn off as there's more exposed surface water. Not just the total volume of water linearly. Ie. It doesn't scale that way.

    The 10% bottles have a shelf life of around 6mo or so, depending on the conditions they're stored in. The 8.25% bottles are about a year.
    You can test them with a test kit from Taylor specifically designed for testing higher concentration chlorine sources, but It's a bit spendy. Cheaper to use some 1ml pippettes and a few large mixing beakers. Search the forum for Chem Geek's instructions.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

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    Re: How much Chlorine/Bleach is normal usage?

    We're using 10%, approx. 36 to 40 oz. per day, with a 2ppm Chlorine drop daily, with CYA at 50ppm.
    At 15,200, we equal about 84% of your pool in gallonage.
    All other things being equal, you would likely use about 43 to 48 oz. of 10% per day to maintain the 5-6ppm FC that we do.
    So, I have to agree, as JasonLion says, there's something else going on with your pool.
    Alan in Wellington, FL - near West Palm Beach
    15,200 gal IG, painted plaster, 1988; 200 SqFt cartridge filter, 2013; 1.5 HP 1-speed pump (uprated), 2005; heat pump, 2005;
    soon to repair (dead) SWG AquaRite T-15 cell, 2005, and replace (dead) suction-side cleaner, 2005.
    Almost everything died this winter 2012-'13, and I know we shouldn't complain... but, Arrgh!

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    Re: How much Chlorine/Bleach is normal usage?

    I added 2 lbs of Cal Hypo last night, results tonight (Taylor 2006)

    FC - 6
    ph - 7.4
    CYA - 45-50
    Alk - 90
    Ca - 300

    I buy the shock, I double checked, it is $4/gal at pool store, sold at 10% 'pool shock'. They go through a pallet a week it looks like, there does not appear to be a date on the bottle, or the box it came in. There is a code on the bottle, could have some date info in it.
    Houston Texas - 18 k gals pool, Hayward 2 HP main pump, 0.75 hp boost pump, 2 HP waterfall pump, Hayward H400 idl Heater, DE filter
    Polaris 280 pool bot - Taylor 2006 Test Kit - BB (no Borax yet)

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    pwrstrk's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    Can you post the code on the bottle. Sometimes the code has info when it was made.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: How much Chlorine/Bleach is normal usage?

    Code on last 2 bottles used this weekend - 2 different boxes of 4 bottles of 'shock' in each
    - code 1 - 13 120 08:04 B2 TX-01
    - code 2 - 13 144 22:12 B2 TX-01
    Houston Texas - 18 k gals pool, Hayward 2 HP main pump, 0.75 hp boost pump, 2 HP waterfall pump, Hayward H400 idl Heater, DE filter
    Polaris 280 pool bot - Taylor 2006 Test Kit - BB (no Borax yet)

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    pwrstrk's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    1 - made 2013 120th day of the year in TX
    2 - made 2013 144th day of the year in TX


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Charlie_R's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    Quote Originally Posted by tjf120
    Code on last 2 bottles used this weekend - 2 different boxes of 4 bottles of 'shock' in each
    - code 1 - 13 120 08:04 B2 TX-01
    - code 2 - 13 144 22:12 B2 TX-01

    13 = year

    120 = day of year

    08:04 = time that bottle got filled

    B2 = bottling line

    TX-01 = plant
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Re: How much Chlorine/Bleach is normal usage?

    Ok, so bleach should be ok based on date, still going through a lot of chlorine. I 'super-chlorinated' a couple weeks ago to kill some black algae. Haven't seen any new blooms, still scrubbing a few spots where the black is in the plaster (ie, the plaster is somewhat porous, black is below the 'surface' of the plaster)
    Houston Texas - 18 k gals pool, Hayward 2 HP main pump, 0.75 hp boost pump, 2 HP waterfall pump, Hayward H400 idl Heater, DE filter
    Polaris 280 pool bot - Taylor 2006 Test Kit - BB (no Borax yet)

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    pwrstrk's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    You can still use it.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: How much Chlorine/Bleach is normal usage?

    Do you really want a FC of 6. I'm new to pool maintenance but I'm trying to stay between 1-3 with no CC. 7.4-7.6 ph and my borate is at 60 ppm and my CYA is at 40. When/why should I add shock?

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    Re: How much Chlorine/Bleach is normal usage?

    Quote Originally Posted by terryc
    Do you really want a FC of 6. I'm new to pool maintenance but I'm trying to stay between 1-3 with no CC. 7.4-7.6 ph and my borate is at 60 ppm and my CYA is at 40. When/why should I add shock?
    See the Chlorine / CYA Chart in the Pool School. If you have only 1 or 2 ppm FC with 40 ppm CYA then algae can grow faster than chlorine can kill it. You can get lucky, but you should be keeping your FC at a minimum of 3 ppm at all times so that means higher than that at times unless you have an automatic dosing system. The borates in your pool do act as a mild algaecide, but we've never worked out precisely how much lower you could have your FC when you have borates, but it's not that much.

    What the pool industry doesn't tell you is that when there is CYA in the water, most of the chlorine is bound to it essentially inactive. It is the unbound active chlorine that kills algae and disinfects the pool, but to get enough active chlorine you have to have a higher FC level when the CYA is higher. Recommending an FC range independent of the CYA level is completely ludicrous, yet that is what the pool industry touts -- with the result of a very profitable industry selling algaecides, phosphate removers, clarifiers, flocculants, enzymes and "shock" products that are nothing more than higher margin chlorine products identical to other chlorine products with the same chemicals.

    If you properly maintain the appropriate FC level for your CYA level then you should not need to shock your pool on a regular basis. You would only shock if an unusual circumstance occurs. Many members only shock their pool when they open the pool during spring. I haven't needed to shock in a few years because I keep chlorine in my pool over the winter (it doesn't freeze).
    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"

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    y_not's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    Quote Originally Posted by tjf120
    I 'super-chlorinated' a couple weeks ago to kill some black algae. Haven't seen any new blooms, still scrubbing a few spots where the black is in the plaster (ie, the plaster is somewhat porous, black is below the 'surface' of the plaster)
    Did you follow the shock procedure in pool school, and only stopped once you passed all 3 criteria?
    Shocking is a process, not a product you dump in the pool.

    Also, are you sure it is black algae? Ba is slow to appear and just as slow to go away, as it is highly chlorine resistant. It grows in layers with a hard shell between each layer. Chlorine alone will not kill it, a stainless steel brushing daily, multiple times per day is necessary to break off its CL resistant shell so the CL can then get to it. Layer, by layer, by layer. You keep the pool at shock levels until it is gone.

    To verify you have BA, scrape it with your finger and smear it on a piece of paper. It should leave a dark green and black smear behind. You can also take a trichlor or dichlor tablet, place it in a sock and weigh it down on top of the spot for 1hr. After one hour, remove tablet and sock, checking the black spot. If the stain lightens from the bleaching, then its BA.
    Do not leave the tablet for longer than 1hr.
    Ask 1st if you have a colored plaster pool, as I'm not sure if that test is OK in such a situation.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

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    Re: How much Chlorine/Bleach is normal usage?

    tjf120- I am in Cypress and I am currently going through 1 jug (121oz) of 8.25% per day. For my pool (28,000 gal) that works out to just under 3ppm of Cl per day. My CYA level is around 40. During cloudier times I still add 1 jug but can skip a day every 3 or 4 days.
    23x40 freeform w/spa, 28,000 gal. PCC-2000 in-floor cleaning. Pebble Sheen w/flagstone coping. 14' weeping wall, (2) 18" sheer descents. Sta Rite- cart 400 sqft. filter, Intellipro VS pump, 1hp (cleaning)2hp (water feature)Max E Pro's. Easy Touch 8 function w/IPod. Rainbow chlorinator, Paramount Clear O3 (I know, I know), Max-E-Therm 400K heater.

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    Re: How much Chlorine/Bleach is normal usage?

    Quote Originally Posted by y_not
    Quote Originally Posted by tjf120
    I 'super-chlorinated' a couple weeks ago to kill some black algae. Haven't seen any new blooms, still scrubbing a few spots where the black is in the plaster (ie, the plaster is somewhat porous, black is below the 'surface' of the plaster)
    Did you follow the shock procedure in pool school, and only stopped once you passed all 3 criteria?
    Shocking is a process, not a product you dump in the pool.
    If the 3 criteria are
    Repeat steps 3 and 4 as frequently as practical, but not more than once per hour, and not less than twice a day, until:
    1 - CC is 0.5 or lower;
    2 - An overnight FC loss test shows a loss of 1.0 ppm or less;
    3 - And the water is clear.

    Yes, shocked for ~10-14 days, chlorine levels of 15-30 ppm during the duration.
    Houston Texas - 18 k gals pool, Hayward 2 HP main pump, 0.75 hp boost pump, 2 HP waterfall pump, Hayward H400 idl Heater, DE filter
    Polaris 280 pool bot - Taylor 2006 Test Kit - BB (no Borax yet)

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    y_not's Avatar
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    Re: How much Chlorine/Bleach is normal usage?

    Your minimum shock level is 20ppm.
    Thanks for reading... - Tony
    Da' Pool: Intex 15'x42" 3284gal AGP EasySet (Inflatable Ring) - (Summer 2014: 27' round EW /w 6.5' deep end @ 22,500gal)
    Pump & Cart Mod: 1000gph Cart. 5ft² - 2 nylons, 24/7 OP. Traps bugs/bits, lasts longer/cleans easier = Happier Pool Owner!!
    The Bible for a "Trouble Free Pool" life = PoolSchool, the BBB method a TF100 test kit(Recommend Kits Compared). - Cleaning a Sand Filter
    Water looks like GLASS, if yours doesn't...SLAM IT! Feels nice and never been happier!!! :D

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