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Thread: dpd powder - slam

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    anguspoe's Avatar
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    dpd powder - slam

    in the process of slamming my pool, got home after work and pool has lost its green look and now is a milky white color.

    went to test FC, got my water, scoped in some r-0870 and nothing. no change in color......???

    I'll post a full set of numbers when I get back to the house.

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    JasonLion's Avatar
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    Re: dpd powder - slam

    That normally means that the FC level is zero, though now and then that can happen if FC is very high and you didn't add enough powder. If you have an OTO chlorine test handy, that is the most reliable way to see if FC is really zero, or is actually high.
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    anguspoe's Avatar
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    Re: dpd powder - slam



    haha I brought it with me.

    my pH has been climbing very quickly as well. started slam last night and pH was 7.5

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    Mod Squad jblizzle's Avatar
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    Re: dpd powder - slam

    Your FC is 0ppm.

    Lower the pH into the 7s and then raise the FC back up to shock level.

    - - - Updated - - -

    What is your CYA?
    Jason, TFP Moderator
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    anguspoe's Avatar
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    Re: dpd powder - slam

    CYA 10-20. i could see the dot with the tube full. can I add while slamming

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    Mod Squad jblizzle's Avatar
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    Re: dpd powder - slam

    Yes, you should get the CYA up to around 30ppm so that you do not lose as much FC to the sun.

    I would add about 20ppm, in a sock and put it in the skimmer, and continue to slam assuming you are up around 30ppm. Then in a week verify the CYA level.
    Jason, TFP Moderator
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    anguspoe's Avatar
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    Re: dpd powder - slam

    how long before I retest pH after adding acid?

    pool 17200

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    Mod Squad tim5055's Avatar
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    Re: dpd powder - slam

    Quote Originally Posted by anguspoe View Post
    how long before I retest pH after adding acid?

    pool 17200
    at least 30 minutes, but an hour is probably better (pump running the entire time).
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Patrick_B's Avatar
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    Re: dpd powder - slam

    I prefer 1 hour for my testing after addition.
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