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Thread: How Many Chlorine Pucks to Put in at Once?

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    How Many Chlorine Pucks to Put in at Once?

    Happy Independence Day to the US. Just did another full test today. These are are the results:

    FC 2.5 ppm
    CC 0.5 ppm
    TC .03 ppm

    TA = 160

    CH = 300

    CYA 70

    pH 7.8

    The FC seemed low, so I put in a 3" chlorine puck in the floating chlorine dispenser. Should I put in more than one puck at a time? The pool guy usually put in four per week in the dispenser, but he only checked the pool once per week. Since I'm here, I can check more frequently. This is my first week going solo and taking care of the pool myself.

    I understand the pucks are bad because they cause CYA to accumulate. Unfortunately, I just bought an 25 pound bucket. I haven't opened it yet, so I guess I could send it back, but shipping will cost a fortune. I think I'll try to use it up and then switch to the liquid bleach method.

    Finally, the pH is high, so I guess I should also add more muriatic acid as well.
    Sand filter, in ground pool, plaster bottom, Hayward Max-Flo II pump

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    Richard320's Avatar
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    Re: How Many Chlorine Pucks to Put in at Once?

    None.

    CYA is already 70!! You don't give pool size, but just for argument, call it 20,000 gallons. That's a good-sized pool. If you add 25 pounds of trichlor, you will raise CYA by 83!!! If your pool is smaller, that will go up even more.

    The pucks will keep for a long, long time. Save them for when you go out of town.

    You need bleach.

    Have you read Pool School?
    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.
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    duraleigh's Avatar
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    Re: How Many Chlorine Pucks to Put in at Once?

    Yep, None for all the reasons listed above.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: How Many Chlorine Pucks to Put in at Once?

    I'm not sure how many gallons the pool is. It's odd-shaped and of varying depth, so it's hard to calculate the volume. I understand your point. I guess I will stop at Walmart and pick up some 6% bleach. Thanks for the replies.
    Sand filter, in ground pool, plaster bottom, Hayward Max-Flo II pump

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    Mod Squad jblizzle's Avatar
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    Re: How Many Chlorine Pucks to Put in at Once?

    Post a picture and dimensions and we can help you estimates the volume.

    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    Jason, TFP Moderator
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    Re: How Many Chlorine Pucks to Put in at Once?



    This is embarrassing. Now everyone can see what an ugly pool and yard I have. The pool is about 6 feet deep in the middle. The max width dimension is about 17 or 20 feet. Lengthwise, it must be around 30 to 35 feet. The wide section up to the island portion is probably about 25 feet long and the island adds another 8 feet. The water around the island is shallow. That is where you're supposed to step into the pool and then it gradually becomes deeper as you walk towards the center.

    The spa portion is about 5 feet by 8 feet.
    Sand filter, in ground pool, plaster bottom, Hayward Max-Flo II pump

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    dattia's Avatar
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    Re: How Many Chlorine Pucks to Put in at Once?

    Hmmm.... I wish I had an 'ugly' pool like yours!
    27' round AG
    Hayward Matrix 1 1/2 HP Pump
    Hayward S210T Sand Filter

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    Re: How Many Chlorine Pucks to Put in at Once?

    No Ugly there!
    I got a lot of dirt I'm working on after a new install of a 21' round buried 14" and 6'ft deep center, did I say LOTS of dirt!
    The only ugly you could possibly have is to not listen to the advice given by some of the best here on this forum!
    P.S. Use bleach or liquid chlorine.
    pH could be adjusted down to 7.2 to help lower you TA.

    Chuck
    Swim n Play 21' round, expandable 72" liner, 6FT deep center, buried 14", 12,750 Gallons
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    harleysilo's Avatar
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    Re: How Many Chlorine Pucks to Put in at Once?

    Awesome pool! Love the island!

    Now is it just the pic or is the water a little cloudy? This place will fix that for you!
    18'x43' Sport Pool
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    Re: How Many Chlorine Pucks to Put in at Once?

    Yeah, put the bucket of pucks in the shed. They will keep. You don't want your CYA higher.....start using liquid bleach, then you can use up the pucks when your CYA goes down (I was on bleach for a year or so before I started using pucks again.)
    IG Plaster 20,000gal, attached spa w/ spillover, hayward C12002 cart filter, 1 1/2hp pump w/ polaris 360
    6/16/12 - PH 7.6, FC 6, CC 0, CYA 30, TA 80, Calcium 310

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    Smykowski's Avatar
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    Re: How Many Chlorine Pucks to Put in at Once?

    I read the title of this thread, and I wanted to immediately post NONE. However, like always, you immediately got great advice, so I'll have to come up with something else of value to say. Here it is:

    Pucks aren't evil, even though by reading a lot of the posts here you might think so. They're just not for everyday use. Vacations only, and that's only if you understand what they're doing to your water.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Richard320's Avatar
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    Re: How Many Chlorine Pucks to Put in at Once?

    Quote Originally Posted by Chaika


    This is embarrassing. Now everyone can see what an ugly pool and yard I have. The pool is about 6 feet deep in the middle. The max width dimension is about 17 or 20 feet. Lengthwise, it must be around 30 to 35 feet. The wide section up to the island portion is probably about 25 feet long and the island adds another 8 feet. The water around the island is shallow. That is where you're supposed to step into the pool and then it gradually becomes deeper as you walk towards the center.

    The spa portion is about 5 feet by 8 feet.
    You're gonna need to drag out a tape measure to get more accurate dimensions. Accurate to within 2 inches, not 5 feet!

    And stop apologizing for the look - this is the BEFORE picture!
    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!

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    Re: How Many Chlorine Pucks to Put in at Once?

    Thanks everyone. My tape measure died trying to measure that pool. Refused to retract after I did a couple of measurements. Might have been because I got some water in it a few weeks ago trying to measure the diameter of some pvc pipe in the pool. Yes, the pool water does look a little cloudy in the photo. I may have dialed the pump far too back. It was also a rare cloudy day here when I took the photo. It actually rained.
    Sand filter, in ground pool, plaster bottom, Hayward Max-Flo II pump

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