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Thread: How long before 3" trichlor tab disolves?

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    How long before 3" trichlor tab disolves?

    Anyone know about how long it takes for a 3" trichlor tab to disolve in a floating dispenser? I will use them when going on vacation and need to do some calculating.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    JasonLion's Avatar
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    Re: How long before 3" trichlor tab disolves?

    It varies a great deal, depending on the specific dispenser, the water temperature, how much water movement there is, etc. So not at all easy to calculate.
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    Re: How long before 3" trichlor tab disolves?

    Dispensers also have settable vanes. In my pool 10 years ago when I used Trichlor before I new better, the 3" 8-ounce tablets needed replenishing after around 5 days. They wouldn't be gone by then, but would be down small enough that they wouldn't put out enough chlorine fast enough. However, as Jason says, it really depends on a lot of factors. It's probably the case that for most dispensers it's roughly somewhere between 3 and 7 days. You generally can't go much longer than a week with a dispenser. Adding more tablets just has greater output, unless some are out of the water and drop down as others get used up. Others should chime in since perhaps there are dispensers where the tablets dissolve more slowly.
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    Re: How long before 3" trichlor tab disolves?

    Thanks for the replies. I think I will put one in a floater and see about how long it will take.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Re: How long before 3" trichlor tab disolves?

    Quote Originally Posted by easttn View Post
    Thanks for the replies. I think I will put one in a floater and see about how long it will take.
    As stated, I'm sure it varies greatly, but I put four floaters in a pool which started with 0 CYA, and it took at least a week for the 5 or 6 3" tablets inside to be small enough to warrant replenishment.

    NOTE: That fourth sun-beat-up floater was temporarily pulled from the trash as an emergency replacement in order to get the CYA levels up.
    Silicon Valley, 38,500 gallons in-ground plaster; Sta-Rite System 3 Model S8M150, 259 sqft cartridge 25022-0203S + 191 sqft cartridge #25021-0202S = 450 sqft filter@0.28gpm/sqft = 125 gpm@50psi max. Three 220v Sta-Rite Max-e-Glas II pumps {AO Smith QC1102 1.0x1.65SF for filter + cleaner; SQ1152 1.5x1.47SF for spa jets; square 48Y flange}. 13 Fafco 12'x4' professionally installed "Revolution" solar heating panels + Raypak RP2100 P-R 405A-EP LPG 399,000/hour heater + Compool Lx3600 controller + Infinity 4000 automatic pool cover (120v 3/4 HP motor); both skimmers are NOT filtered & serve only as intake for 9-port water valves (aka cleaner heads) controlling fifteen Paramount PCC2000 3" self-cleaning jets with the optional Debris Containment Canister.

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    Re: How long before 3" trichlor tab disolves?

    I put one in a floater sunday around noon with the vanes set all the way open and it doesnt appear that much has dissolved. I layed the tablet flat and the floater is away from the return where it will dissolve slower. It looks like it may last a week but too early to tell.
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    frustratedpoolmom's Avatar
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    Re: How long before 3" trichlor tab disolves?

    7 or 8 days is what I've found.
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