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Thread: LC or granular... Who is right?

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    LC or granular... Who is right?

    I am trying to follow BBB; however, we just had a new liner installed and the installer said to NEVER use liquid chlorine and to stick with granular. He said the LC can cause the liner to wear prematurely.

    2003 Marquis Euphoria - 400gal

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana
    Why would pool stores sell liquid chlorine? Nearly 3500 members here, 21,000-ish at PF, almost all non-SWCG users are using liquid chlorine. I'd bet close to half have vinyl liners when you consider AG pools, and I've never seen a post about liner fading from liquid chlorine, but I've seen dozens about granular chlorine causing liner damage.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Join Date
    Mar 2007
    San Rafael, CA USA
    Nevertheless, with any addition of chemicals (with few exceptions, for CYA, PolyQuat, etc.) you want to pour slowly over a return flow in the deep end with the pump running. For extra safety, lightly brush the side and bottom of the pool in the area where you added chemicals in order to thoroughly mix them. Chlorinating liquid or bleach is denser than water so if dumped in quickly can settle to the bottom, but the same is true for granular chlorine. Above ground pools typically do not have floor drains so have poor circulation at the bottom of the pool so some manual mixing is wise.
    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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    Thanks for the reassurance guys. BBB it is.
    2003 Marquis Euphoria - 400gal

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    A relative of mine has a big spot in the middle of the deep end of his pool where the vinyl has faded. He has no main drain and poured a huge slug of 12% chlorine in one spot in the deep end. I didn't ask him as I didn't want to embarrass him but I would bet he did it without the filter running.

    I have used liquid chlorine for about five years now with no fading of my liner. As with ANY chemical addition, keep the filter running for at least 1/2 hour after adding the chlorine. Pour it slowly dispersed around the deep end or in front of a return jet and there is no problem.

    19,000 vinyl pool, solar heat, .75 hp tristar, 48 sq ft de filter

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