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Thread: I have a couple of questions about testing.

  1. Back To Top    #1
    Tricia1969's Avatar
    Join Date
    Aug 2014
    North Alabama

    I have a couple of questions about testing.

    When I was doing the FC test, it became pinker the longer it sat there. Is the determination of pink - ness supposed to be immediate, or wait like 30 seconds?

    And, when Slamming, do you try to maintain the initial shock FC throughout, checking only FC, or are you adjusting with new FC and CYA levels each time?

    Thanks ahead!
    36000 Gallon, IG, biggest Hayward sand filter, vinyl liner, Polaris vacuum

  2. Back To Top    #2

    Join Date
    Jun 2013
    South Florida

    Re: I have a couple of questions about testing.

    The sample will turn pink right away when you add the correct amount of powder (one heaping scoop, or two level scoops).

    When SLAMing, you first adjust your pH to the appropriate level. Then you initially raise FC to the target value. The target value is based on your measured CYA level.

    After you raise FC to the target value, you check periodically and add chlorine as required to MAINTAIN your FC at the target value until you pass the criteria to stop the SLAM.
    10,000 gallon in ground diamond brite, Circupool si30+, Hayward C900 cartridge, 1.5hp Flotec single speed pump

  3. Back To Top    #3

    Join Date
    Aug 2010
    Dallas, TX

    Re: I have a couple of questions about testing.

    After you test a lot, you'll get to the point you know whether or not you have enough FC the instant the powder hits the water. But for now, just make sure you have it stirred really well before you start adding the drops.

    No kidding, I can get my 10ml sample of water, and when the powder hits (I use my SpeedStir for this) I know immediately if I am low. "oh ****" usually goes through my head at that point.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: I have a couple of questions about testing.

    You should not let the FAS-DPD sit around. Add the powder mix it in, Count the FC drops, add the CC reagent, count the CC drops. Done. If you leave it sit it will turn back to pink (this does not matter).

    While SLAMing, assuming you are using liquid chlorine link you should, the CYA will not be changing. You just want to test the FC and CC while SLAMing.
    Jason, TFP Moderator
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