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Thread: Perlite grades and filter speed

  1. #1
    Join Date
    Sep 2005
    Green Bay, WI

    Perlite grades and filter speed

    OK, just because I can't leave anything well enough alone, I've recently switched from 3um (27-m) perlite to 7um (23-s) perlite in my filter. Clarity is similar, but filtration time and peak pressure have gone up dramatically. You'd think using coarser perlite would reduce time and pressure. What am I missing?

  2. #2
    Join Date
    Feb 2003
    Las Vegas
    Possibly you are letting more crap through the coarser cake that is actually clogging your screens. Maybe you should try precoating with the fine stuff and then body-feeding with the coarser stuff. I have had similar results to what you are describing. IMHO too coarse a filtrate will lead to crappy filtration runs. I'm hardly an expert but I have done what you have done with similar results. Just my 2 cents.
    Big Willey
    "You are what you is." FZ

  3. #3
    Join Date
    Jun 2003
    Louisville, KY
    I believe BigWilley is correct. Maybe add some cellulose fiber to your pre-coat diet.
    Cheers & I'm out!
    David R. Pierce
    NABC & Bank Street Brewhouse
    POB 343
    New Albany, IN 47151

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