Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: To floc or not to floc ...

  1. Back To Top    #1

    Join Date
    May 2009
    Chciago, IL

    To floc or not to floc ...

    Really appreciate all the help here. We are in the process of opening a swamp, have ordered the recommended test because those test strips are useless, so we are testing at the pool store. Used the pool calculator to shock up to 14 (est) at night, have added CYA. Test results 24hours later:
    FC 4.0
    CC 0.0
    pH 7.6
    CYA 35
    TA 119

    We have vacuumed, backwashed, filter looks good. We will have both AM and PM samples tested tonight so that we can get a better idea of what is happening overnight. The water is blue, algae looks dead, but the water is very cloudy. The pool store wants us to use floc. Should we?

    Pool: 20K gallon, sand filter, IG fiberglass,
    1 hp pump

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: To floc or not to floc ...

    You need to keep your chlorine higher if you are fighting algae. If you let it get below shock level the algae will get going again.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: To floc or not to floc ...


    How long did you shock? Our criteria is you are done shocking are:

    You lose less than 1ppm of FC overnight;
    Your CC is .5 or less;
    Your water is clear.

    So keep the FC up to shock level and check to see if it's holding overnight. Sand filters can take a while to clear up dead algae.

    Floc is almost never necessary, though some people like to use it depsite the expense. In your case I would not, give the filter a chance to do it's job. You just added CYA and floc would mean vacuming to waste so much of your CYA level will drop.

    Keep the FC up and make certain that everything is dead. Have you read about Defeating Algae in Pool School?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts