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Thread: Problems with Pentair Rainbow Chlorinator 320

  1. Back To Top    #1

    Join Date
    Sep 2015
    San Antonio

    Problems with Pentair Rainbow Chlorinator 320

    We had our pool installed last year which included the Pentair Intelliflo Variable Speed Pump, large DE Filter, and the Pentair 320. It seems like I'm never able to get a lot of chlorine from the chlorinator even when it is turned on the highest setting. I'm considering switching the feeding tube to the top hole but wanted to hear if anyone else has had the same problem. I tend to run my pump at abour 2250 RPM and getting around 12-15 psi at the filter gauge. We have a 23k gallon pool and I'm running pump about 8 hours a day. Seems like the chlorinator is going through about 1 3 inch tablet a week which doesn't seem like much when turned to the highest setting.

    Any help is greatly appreciated.

  2. Back To Top    #2

    Join Date
    Mar 2015
    Sugar Land , TX

    Re: Problems with Pentair Rainbow Chlorinator 320

    Make sure the outlet hole on bottom ( inside of tube ) is clear. It tends to get clogged from puck when it dissolves.
    8500 gallon IG Pebble Sheen with Spa. 3hp Pentair VS Intelliflo ( pool ), 3/4 hp WhisperFlo ( water feature ),Pentair Racer, 400K Pentair heater, Pentair 500sqft Cartridge filter, EasyTouch 8, Stenner 45mp2 15gallon wired to ET8

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Problems with Pentair Rainbow Chlorinator 320

    I'll spare you the sermon on using pucks, but you should read the "ABC's of pool chemistry".

    Now for the feeder issue.
    The feeder dissolves the tablets by running water across them as the pump runs. The greater the flow, the more the tablet(s) get dissolved.
    What speed(s) are you running the pump?
    How long are you running the pump on higher speed?
    How long are you running the pump on lower speed?

    If you're running the pump on low speed most of the time then moving the flow tube to the top should help by causing more water to flow across the tablets and therefore dissolving the tablets faster.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4

    Join Date
    Jun 2007
    New Jersey

    Re: Problems with Pentair Rainbow Chlorinator 320

    I used to own one of those (long ago retired). As I recollect, top feed is recommended for 3" pucks and the bottom feed for 1"tabs. Also, there is a flexible flow reducer that is sometimes installed in the inside hole. You may want to remove that if it's there.
    Current: 28,000G 18'x36' I/G AnthonySylvan Plaster; Waterway 60 sq.ft. DE Filter; 1.0hp x 1.65 SF Two-Speed (B2982) WhisperFlo; 2004-Present
    Previous: 40,000G 20'x40' I/G Koven unlined WWII salvage 5/8" marine steel; Lomart Stainless Sand Filter; 3/4hp Hayward SuperPump; 1946-2003 (managed by me from about 1964)
    Ancient Taylor K-2000, upgraded with Taylor CH, TA, and FAS-DPD, and TFT CYA tests.

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