Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: How to measure DE for filter

  1. Back To Top    #1

    Join Date
    Aug 2013
    Location
    Hilton Head, SC
    Posts
    129

    How to measure DE for filter

    I'm not sure I'm using the correct measure of DE when I reload my filter after a backwash. I'm using the 1lb 13oz blue plastic Maxwell coffee containers. My filter is a Pentair FNS Plus 36. How many containers of DE should I use on startup (after I have cleaned the filters at the start of the season) and how many after I backwash during the season?

    I am seeing very tiny pieces of debris on top of the pool, and am worried that the filter is not loaded properly. Of course, the pool sits under a live oak, and there is constant material falling in especially during a rain storm or even mild winds.

    thank you,

    ed
    4k, IG, Gunnite, Jandy Valve, 1HP Haywood, 2" flow, single 2" line for skimming & vacuum, Pentair FNSP 36 DE w/125 GPM Multiport 50 PSI, TF-100 Test Kit, built 1991, Hilton Head, SC

  2. Back To Top    #2

    Re: How to measure DE for filter

    Each pound is about 48 fluid ounces (volume). Your filter needs about 4 lbs on a fresh start and about 3.5 lbs after a good backwash.

  3. Back To Top    #3

    In the Industry

    Join Date
    Jun 2015
    Location
    Wildomar, California
    Posts
    423

    Re: How to measure DE for filter

    Also, 1lb of DE is equal to 2 1lb coffee cans. DE is 1/2 as heavy as coffee.

  4. Back To Top    #4

    Join Date
    Aug 2013
    Location
    Hilton Head, SC
    Posts
    129

    Re: How to measure DE for filter

    Quote Originally Posted by OldPoolMan View Post
    Also, 1lb of DE is equal to 2 1lb coffee cans. DE is 1/2 as heavy as coffee.
    This is good info. So I can calculate that a 1lb 13oz container is actually about 15 oz of DE, so if I need 3.5 lbs to recharge after a good backwash, I'll need roughly 4 containers of the containers.

    Is there a danger if I over charge the DE?


    thx

    - - - Updated - - -

    that is, "4 containers of the DE"
    4k, IG, Gunnite, Jandy Valve, 1HP Haywood, 2" flow, single 2" line for skimming & vacuum, Pentair FNSP 36 DE w/125 GPM Multiport 50 PSI, TF-100 Test Kit, built 1991, Hilton Head, SC

  5. Back To Top    #5

    Re: How to measure DE for filter

    The amount of de isn't critical, but you should try to get close to the recommended amount.

  6. Back To Top    #6

    TFP Guide

    chiefwej's Avatar
    Join Date
    Jun 2011
    Location
    Tucson
    Posts
    2,853

    Re: How to measure DE for filter

    I weigh it on a postage scale. That way I know I have the right amount.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •