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Thread: Bleach and Pucks?

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    Bleach and Pucks?

    I am not sure if this is crazy or not but does anybody use bleach daily and trichlor pucks as well?

    My issue is I am going through a ton of bleach, about 100oz daily for my 12,000 gallon pool. my CYA is 40-50 so I bring chlorine up to 8ppm at night everyday. I am losing 4ppm daily.

    Could I offset some of the bleach use by using trichlor pucks? How much chlorine do those add anyhow? Would this dfeat the purpose of using bleach since it adds CYA?

    I have done the TF-100 CYA test multiple times and everytime I am confused, do I go until I can't see the dot at all? I mean i get to a point where it is **** hard to see it but can still see it just barely, is that right?
    12,000 Gallon
    Hayward 2HP Pump
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    Built 2004, bought Dec 2007
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  2. Back To Top    #2
    JasonLion's Avatar
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    Re: Bleach and Pucks?

    Trichlor adds chlorine, CYA, and lowers PH. You probably don't want to use trichlor for very long because your CYA level is already good and CYA is difficult to lower.

    Losing 50% of your FC over a sunny day is normal for a CYA level around 50.

    You keep going till the black dot completely vanishes and all you see is a uniform white cloudiness.
    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

  3. Back To Top    #3

    Re: Bleach and Pucks?

    so its sunny everyday here, so the best answer is to go through 3-4 196oz bleach bottles per week.
    12,000 Gallon
    Hayward 2HP Pump
    Solar Panel
    TF-100 Kit
    Built 2004, bought Dec 2007
    BBB All the Way

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    JasonLion's Avatar
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    Re: Bleach and Pucks?

    If you have lots and lots of direct sunlight you could try CYA levels in the 60 to 80 range. That requires higher FC levels, but protects the chlorine from sunlight much more effectively, so the total chlorine usage goes down.
    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

  5. Back To Top    #5

    Re: Bleach and Pucks?

    Just did a test that I have been forgetting about.

    my FC was 3.5 and I added 112oz 6% chlorine per the pool calculator, it is now and hour later and tested again FC is 6.0, but the amount of chlorine added should have brought to 8.

    what is wrong? maybe i'm not using 4ppm per day
    12,000 Gallon
    Hayward 2HP Pump
    Solar Panel
    TF-100 Kit
    Built 2004, bought Dec 2007
    BBB All the Way

  6. Back To Top    #6

    Re: Bleach and Pucks?

    forgot to add that CC is 0 or extremely close to 0. I just shocked a week ago as well, no visible algae or anything poollooks perfect.
    12,000 Gallon
    Hayward 2HP Pump
    Solar Panel
    TF-100 Kit
    Built 2004, bought Dec 2007
    BBB All the Way

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    Re: Bleach and Pucks?

    I was just thinking about this same issue this morning. I was away for the last couple days and had my wife checking the CL levels. We have had VERY sunny days for the last week and I can't seem to keep a FC level above 2. My CYA level is about 40 and I am using a LQ with 12.5% chlorine. I was thinking that since my CYA level is reasonable, I could supplement with pucks at a low flow rate. Thoughts?
    28,000 gallon gunite/white plaster with 30ft RBB and 2ft sheer descent, 100 sq ft thermaledge, 50sq ft spa w/ 6 jets
    2HP Jandy pump, 60sq ft Jandy DE filter, 400,000 BTU Jandy LX Nat Gas Heater, 2 Jandy color lights + Jandy color spa light, Jandy Aqualink RS6, Jandy AquaPure 1400

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    JasonLion's Avatar
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    Re: Bleach and Pucks?

    If you want your CYA level to go up, and you keep an eye on PH so it doesn't go too low, trichlor tablets/pucks are a reasonable and convenient choice. But it is very easy for trichlor to get overused and then CYA levels get too high and then there can be problems.

    There are many ways chlorine levels can come out differently than you expect. 6% bleach isn't always 6%. Some people have bought 6% bleach that was actually as high as 8% or as low as 0%. Bleach spoils slowly in storage so they usually manufacture it at a slightly higher percentage and then it goes down depending on how long it has been on the shelf and how hot it gets. It takes many months for there to be significant loss of strength at reasonable temperatures, so it isn't usually an issue, but sometimes it is.

    It is also possible for there to be various errors in your measurements, pool size might be different, FC level might be a little higher or lower than the test result, etc. None of the tests/measurements are ever exact.

    And, of course, it is possible for the pool to have higher chlorine demand than you expect. There could be something in your water consuming chlorine.

    When the results aren't what you expect, it is often difficult to sort out which of these effects is at work in your situation.
    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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    Re: Bleach and Pucks?

    Jason -

    yep...exactly why i'm asking...I don't quite understand why I appear to be using so much FC. My CC's have consistently been ZERO since opening the pool in April. With the high temperatures we have been having, the kids have been in the pool pretty constantly. My PH seems to float upward since stopping the use of the trichlor pucks about a month ago, and since there's been a lot of splash out combined with evaopration, i'm replacing water pretty consistently (1-2 inches a week), my CYA level has trended downward. So, you would think using an active combination of bleach and pucks is OK, so long as I'm monitoring the chemistry?
    28,000 gallon gunite/white plaster with 30ft RBB and 2ft sheer descent, 100 sq ft thermaledge, 50sq ft spa w/ 6 jets
    2HP Jandy pump, 60sq ft Jandy DE filter, 400,000 BTU Jandy LX Nat Gas Heater, 2 Jandy color lights + Jandy color spa light, Jandy Aqualink RS6, Jandy AquaPure 1400

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    frustratedpoolmom's Avatar
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    Re: Bleach and Pucks?

    Do you have some left over?

    I feel like they are not usually recommended because of their cost and the assorted problems that develop from continous use by people who don't understand the resulting chemistry problems.

    You do seem to "get it", so if you already have them and/or don't mind the added expense, sure you can use them. Just keep testing and making the appropriate adjustments to your water chemistry.

    I did go thru a period of ajustment after I stopped using tri-chlor. I LOVED the convenience and it took time for me to "get over them"...
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
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    JasonLion's Avatar
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    Re: Bleach and Pucks?

    You can rule out something in the water using up chlorine by doing an overnight FC loss check. If FC remains the same overnight, or only drops by 0.5, then your water is fine.
    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

  12. Back To Top    #12

    Re: Bleach and Pucks?

    Depending on your area, this spring there's been a TON of pollen in the air, much more than previous years.

    If you are losing FC overnight, this could be a likely cause.

  13. Back To Top    #13

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    Re: Bleach and Pucks?

    the overnight FC loss is a good idea....didn't think of that (though I should have....no different that what you want to do if shocking). Since I'm around this weekend, I'll give it a shot. I also just adjusted my pump schedule to go 2.5 hours in the AM and then 9.5 hours in the PM (until 10PM) thinking that some more time running in the evening hours would help the FC situation since we pretty much get full sun from 10am onward.

    as for the pucks...I do have some leftover ones. The only problem is that I would need to drill another hole in my plumbing if I want to run both the LQ and the rainbow puck chlorinator (i used the existing hole for my LQ)....besides that, i think i'll do it just to give me some flexibility.
    28,000 gallon gunite/white plaster with 30ft RBB and 2ft sheer descent, 100 sq ft thermaledge, 50sq ft spa w/ 6 jets
    2HP Jandy pump, 60sq ft Jandy DE filter, 400,000 BTU Jandy LX Nat Gas Heater, 2 Jandy color lights + Jandy color spa light, Jandy Aqualink RS6, Jandy AquaPure 1400

  14. Back To Top    #14

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    Re: Bleach and Pucks?

    I'm seeing exactly the same thing as nitz369. My CYA is about 60 ppm. The water temperature is between 84 and 87 F which is the highest I've ever seen it.

    I boost up the chlorine to 8 ppm each evening and by the next evening it's between 0 and 3 ppm. CC is always under 0.5 ppm and the water is generally clear. Given the heat, sun, and bather load this chlorine consumption seemed reasonable to me.

    I'm buying 6% bleach from Costo at $7 for three 182 oz bottles. So, the 64 oz I typically add each evening costs $0.82.
    11x27 in ground, vinyl pool
    ~12,500 gal
    PAC FAB (Pentair) Pinnacle 3/4 hp pump
    Pentair 24 sq ft DE filter
    One skimmer, one return (no main drain)

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    Rockcrawler's Avatar
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    Re: Bleach and Pucks?

    I live in El Paso, where we get 300 day a year of sun, I cover the pool with a solar cover anytime anyone isn't swimming, the solar cover/or any cover will prevent the sun from eating up your clorine, I know its a pain in the ***** I've been doing it for 3 yrs now, but it save on chemicals or wear and tear on your SWG

    Rob
    13,000 IG Plaster, 2hp whisperflo pump, 48 sq in pentair DE Filter, 1 skimmer, 2 eyeball outlets, 200 sq ft solar panels on second story, Auto Pilot SWG-36, Polaris ATV Cleaner

  16. Back To Top    #16

    Re: Bleach and Pucks?

    Okay so did another CYA test and it is 35 actually, it was 50 earlier, the autofill must be adding lots of water lately.

    Soooo.....

    Could my issue be too low of CYA?? Should I bump it up to 50?
    12,000 Gallon
    Hayward 2HP Pump
    Solar Panel
    TF-100 Kit
    Built 2004, bought Dec 2007
    BBB All the Way

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