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Thread: Tri-Chlor Pucks in the skimmer basket, bad idea?

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    ctakim's Avatar
    Join Date
    May 2012
    Phildelphia, PA

    Tri-Chlor Pucks in the skimmer basket, bad idea?

    Okay so I only use Tri-chlor pucks sparingly and I keep a close watch on my CYA (currently below 20). I also supplement with liquid bleach as needed. But my question is when I use the Tri-chlor pucks is it a bad idea to put them in the skimmer basket? I presume that it may run higher concentrations of chemicals through the filter, especially at start up of the pump, but I'm not sure how bad this is.

    My only alternative is to use one of those floaty things since I don't have an in line chlorinator.

    Any advice for what I should use for Tri-chor pucks?
    Crackin' Toast, Grommit!
    29,000 gallon in ground, white plaster, with spillover Spa with 6 jets, 1 hp pump, Jandy DEV-60 DE Filter, Raypak 406a 400K Natural Gas Heater, Baracuda S3 Robotic, Jandy Aqualink RS4, TF-100 Test Kit
    New BBB enthusiast

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Tri-Chlor Pucks in the skimmer basket, bad idea?

    If you are running the pump 24/7 putting trichlor in the skimmer is fine, but otherwise using a floater is better.
    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: Tri-Chlor Pucks in the skimmer basket, bad idea?

    Before I switched to BBB, I put pucks in the skimmer for over 20 years with no problems. CYA got out of whack this year due to using too much granulated chlorine to shock the pool at startup, so I switched to liquid chlorine as my primary source. Next year if my CYA starts low as it does every year, I will probably use pucks again until CYA reaches 50 and then switch to liquid chlorine. And I will probably put them in the skimmer again.
    21,100 IG Vinyl
    Hayward Pump
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    Taylor K-2006 Kit

  4. Back To Top    #4

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Tri-Chlor Pucks in the skimmer basket, bad idea?

    Some people have reported problems with their copper heat exchangers and their pump seals after using Trichlor in the skimmer, but they were using standard Trichlor pucks and had on/off pump cycles. There are some types if Trichlor sticks (BioGuard® Silk Smart Sticks®) that don't dissolve much when there is no water flow so are presumably safe for the skimmer.

    Our recommendations are normally based on what works for most people in most situations. The acidity of Trichlor is not a good thing when dissolving in a skimmer -- not good for the area near the skimmer and not good downstream when the pump goes on. I used Trichlor pucks in a floating dispenser in my pool years ago and the dispenser "parked" itself near some stainless steel bars I have in the pool and it rusted the mounts closest to the feeder (we're talking about 1-2 feet away, not right next to it). Those same mounts are STILL rusting 8 years after I used that Trichlor while the others that were away from the pucks are still perfectly fine.
    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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