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Thread: Yeast still visible after filter Supradisc II

  1. #1
    Join Date
    Feb 2016
    Location
    Glendale, WI USA
    Posts
    14

    Yeast still visible after filter Supradisc II

    We are using the Pall filter with 3 16" k700 Supradisc II mods. We have been running at a very slow rate and maintaining a differential pressure of 1-2 psi. We typically will have to turn the pump speed up because of the back pressure in the tank but we try to run as slow as possible to filter out more. What I am noticing is that even after doing this within a week or two yeast sediment will build up in the bottom of the site glass on the brite tanks. We are doing mostly lagers and was recommended the k700's buy Pall. Any info or suggestions are greatly appreciated. Thanks

  2. #2
    Join Date
    Jan 2017
    Location
    Aurora, CO, USA
    Posts
    2
    The K700 filters are only rated by Pall to have a retention of 6-15 um (micrometers). In order to remove all yeast the pore size needs to be around 0.45 um.

  3. #3
    Join Date
    Aug 2012
    Location
    PA
    Posts
    83
    Yup, k700 is pretty open and will let some pass by. We run k300 sdII as the primary filter with 1.5 micron profile star cartridges afterwards. This works pretty well, except for heavily dry hopped IPA's can be a PITA.

  4. #4
    Join Date
    Feb 2016
    Location
    Glendale, WI USA
    Posts
    14
    Cool. Gonna have to see if I can exchange these mods and get some 300's. Thanks guy

  5. #5
    Join Date
    Oct 2002
    Location
    Chesterfield, UK
    Posts
    1,753
    If you only want to remove yeast, and are not worried if a few bacteria pass through, then you don't need a 0.45 micron filter. Not sure what sizes they do, but a one micron will be plenty, but you will do better to have your supradisc as the main filter and follow it with a one micron cartridge filter. If you go straight to a one micron, you are likely to blind it very quickly with the other crap in unfiltered beer - proteins etc. Brewers yeast is typically 4 to 7 micron, so you will probably get away with a 2 or 3 micron unit if such a thing exists. Don't forget that this is not sterilising grade - you need a 0.45 micron for that, normally with a 1 micron in front to protect that
    dick

  6. #6
    Join Date
    Feb 2011
    Location
    Richmond, VA
    Posts
    30
    Hi Bavbier,
    Dick Murton is 100% correct, and everyone on this thread is spot on. Typically a K700 will give you a polished, consistent beer, but by no means will it be yeast free. A K300 is one step tighter and will reduce yeast further. With the K300, you shouldn't have yeast building up on the bottom of the brites, but it depends on the yeast, the pressure you are filtering at, and the batch size.

    If all you want is a polished beer that is fairly free of yeast, a K300 should work fine. If you need to have ALL the yeast removed, you would need (as Dick said) to go from the SUPRAdisc II as your primary to a 1um (absolute rated) pre-filter to a 0.45um (bacterially challenged) final filter.

    Before you go wild though, I would try a K300 and see if that works for you. If not, try a K250 before adding extra filtration steps.

    Thanks!

    Milton Leland
    Pall Corporation
    Regional Marketing Manager for the Americas
    Milton.Leland@Pall.com


    PS. Pall Corporation will be at the 2018 Craft Brewing Conference in Nashville Tennessee this Year! Come visit us at booth #2114 and ask all your filtration questions in person (and enter our raffle and win a prize!). Tell them Filter Milt sent you and get something special!

    PPS. While I do work for Pall Corporation, nothing stated here is as an official representative and is simply my informed opinion. For specifics, please contact your local Pall representative and they can help further.

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