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Thread: Granular chlorine vs. liquid

  1. #1

    Granular chlorine vs. liquid

    I was making my usual run to Walmart last night picking up my load of bleach and the guy standing behind me in the checkout line said that he did use bleach until he found the granular chlorine at Lowe's. He said it was cheaper and more convenient than Clorox.

    I have been using bleach for 2-3 years now and have been very pleased other than the inconvenience of carrying bleach jugs. I used a LOT of bleach last year....

    He said it cost him around $125 for his bucket from last year and he did not use all of it.

    Why would I not want to use the dry bleach????

    Just how much bleach should a normal season require???? My pool is 52 in x 30 ft round vinyl AG.
    30ft round; sand; AG; vinyl

  2. #2
    Mod Squad JohnT's Avatar
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    Re: Granular chlorine vs. liquid

    Granular chlorine is most likely dichlor, which means it will rapidly increase your CYA.
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  3. #3
    Senior Member Richard320's Avatar
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    Re: Granular chlorine vs. liquid

    Quote Originally Posted by phyllis
    I was making my usual run to Walmart last night picking up my load of bleach and the guy standing behind me in the checkout line said that he did use bleach until he found the granular chlorine at Lowe's. He said it was cheaper and more convenient than Clorox.

    I have been using bleach for 2-3 years now and have been very pleased other than the inconvenience of carrying bleach jugs. I used a LOT of bleach last year....

    He said it cost him around $125 for his bucket from last year and he did not use all of it.

    Why would I not want to use the dry bleach????

    Just how much bleach should a normal season require???? My pool is 52 in x 30 ft round vinyl AG.
    The powder is going to have either calcium or cyanuric acid as a carrier. The chlorine will go away, the carrier will stay behind. You'll end up with too high Calcium which will likely lead to scaling, or too high CYA, which will make it overstabilized, causing FC to be ineffective leading to an algae bloom. Either one is going to require a drain and refill to get rid of it. Liquid bleach will leave behind salt, that's it.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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  4. #4

    Re: Granular chlorine vs. liquid

    So what is the norm for clorox users???? How much do you put into your pool on a daily basis???? My best friend that got me started with this site uses about a cup per day (or less).... mine is more like a quart per day... once I get it up and going. Now I know that it is going to vary according to the area, the trees involved, and amount of people using the pool. We do have a lot of trees and we are in Arkansas...... HIGH humidity.

    So far I have used 19 jugs (about $28) since Saturday getting it opened up and clear. It had a lot of debris in it due to the fact that our closing did not get done as early in the fall as it should have!! Some people think cutting rice is more important than closing pools!!!! lol We are almost clear ... just a little cloudy but can see the bottom really good.... just not to the sparkling stage yet. The first year I used bleach I was amazed at how my pool SPARKLED in the sun!!!!! It had never done that with the other boat load of chemicals that I was using!!!

    Just trying to figure out if I am doing it correctly. It just seems like I use a LOT of bleach. I probably spent at least $100-$150 on bleach last year.... which is still a lot less than the chemicals I use to purchase.

    Anybody willing to compare their costs???
    30ft round; sand; AG; vinyl

  5. #5
    Administrator JasonLion's Avatar
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    Re: Granular chlorine vs. liquid

    On a 30' round pool I would expect you to use one to three quarts of bleach a day, depending on how much sunlight you get, when things are running well. You will use more, obviously, when you are cleaning up from algae.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  6. #6
    Mod Squad Bama Rambler's Avatar
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    Re: Granular chlorine vs. liquid

    Do you have a good test kit?

    Post a set of test results and how you got them.

    We have a 24' pool and use about a quart a day with 50 ppm CYA. You should use a little more than that.

    If your CYA is a little low you would use more, but from your statement you're using about normal.
    Dave J. TFP Moderator
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    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  7. #7
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    Re: Granular chlorine vs. liquid

    Though the prices are older, Cost Comparison of Chlorine Sources shows that when one accounts for the pH balancing products needed for Trichlor and Dichlor that bleach and chlorinating liquid are less expensive. Cal-Hypo can sometimes be less expensive depending on local pricing, but will increase Calcium Hardness (CH) though if you have a vinyl pool with a low starting CH, then that's an option as a chlorine source.
    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
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  8. #8

    Re: Granular chlorine vs. liquid

    Here are my numbers:

    FC - 11
    CC - 0
    pH - 7.5
    TA - 150
    CH - 150
    CYA - 30

    Still shocking between 11 & 14 according to my CYA reading. Added chlorine 3 times yesterday and twice the day before. I will be able to stay on top of it again today but we are suppose to have heavy thunderstorms moving this way.
    30ft round; sand; AG; vinyl

  9. #9
    Mod Squad Bama Rambler's Avatar
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    Re: Granular chlorine vs. liquid

    Once you're done shocking you can raise the CYA to about 50 and that'll help your FC loss a little. Your normal FC level will go up but your loss due to sunlight will go down.

    Have you ran the OCLT yet?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  10. #10

    Re: Granular chlorine vs. liquid

    OCLT????

    I do have the test kit recommended on this site.
    30ft round; sand; AG; vinyl

  11. #11
    Administrator JasonLion's Avatar
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    Re: Granular chlorine vs. liquid

    Overnight chlorine loss test, see here.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  12. #12
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    Re: Granular chlorine vs. liquid

    My pool was a swamp since i didn't shut it down last year. The Cya and leaves made tons of ammonia in my water, I have used 40 gallons ( @ $2.97 per gallon for 1.42 gallon bottles) and it isn't done shocking yet!!! I can finally see the bottom of my pool though and it's almost done shocking, I only lost 7ppm chlor last night instead of all of it!.
    Wes
    Birmingham, AL

    22000 Gallon In Ground Pool, Vinyl Liner, Sand Filter.

  13. #13
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    Re: Granular chlorine vs. liquid

    Yes, it is hard to look at all those jugs of bleach and it seems like you are spending so much money, but one has to be realistic about what the other choices are. So many of the people who take the commercial product route spend many hundreds of dollars and may or may not actually get the swamp cleared. Those 40 gallons of bleach at $120 is still not that expensive to fix the problems.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

  14. #14

    Re: Granular chlorine vs. liquid

    24' 54" wlal (13.5K Gallons) Brand new pool, zero CYA added 4 lbs of CYA but currently using n2-3 quarts per day currently
    24' Round 54" Impulse Ovation AGP, 1.5 HP 2 Spd, 150 Sq Ft. Cartridge Filter, RayPak 130K BTU NG Heater, BBB in full effect!!
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