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Thread: Blue DE

  1. Back To Top    #1

    Join Date
    Jun 2015
    Saint Marys

    Blue DE

    Just cleaned my DE filter and was surprised to see the DE was blue in color . Wondering if this is something to be concerned about or a sign of a issue? I have used some black algae treatment this summer which was a deep blue in color .But would be surprised this would have turned the DE this color. Any thoughts?
    Installed 1988. inground vinyl liner. 16x32 with deep end and side steps. hard bottom and concrete sides .DE Hayward EC65 filter. Laars Lite 2 LG Heater.1.5 Hayward pump. -run 12hrs/day. Pool on chlorine with bleach as the source as had chlorine block in past.


  2. Back To Top    #2
    Mod Squad Patrick_B's Avatar
    Join Date
    Jun 2011

    Re: Blue DE

    Sounds like a logical choice for the cause. Do you know if this treatment contained Copper? Merely curious, and notifying that's the reason, but wondering. I may have missed it here, but I can't say I recall hearing about Blue DE before.
    TFP Moderator
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  3. Back To Top    #3

    Join Date
    May 2015
    Chickasha, OK

    Re: Blue DE

    You probably used something like Algae Kill II, which is a deep blue -- looks like food coloring -- and contains lots and lots of copper.
    25,000 gallon freeform gunnite/plaster, built in the 1970s/80s; Sta-Rite 9463004 575-lb. sand filter; Sta-Rite single-speed 1.5 HP pump; Raypak RP 2100 natural gas heater (not in use).
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