Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: New home owner question about double filters

  1. Back To Top    #1

    Join Date
    Apr 2015
    Location
    Morton Illinois
    Posts
    14

    New home owner question about double filters

    I moved into my home about two months ago and decided to start up the pool early because I had no idea what I am doing. After some bad advice about copper algaecide and trichlor from the pool store I found this site and began SLAMing my pool with bleach. My green swamp is now a cloudy blue swamp after 8 days of SLAMing! Hooray! Anyways onto my question.

    The previous homeowner left me one 77lbs and one 55lbs intex pool filters and a massive 3/4 HP pump with timer. I filled up the 77lbs sand filter and hooked it up but sometimes really fine particles get past the sand in the filter. This only happened when I was vacuuming up the algae **** on the bottom of the pool. I have since tried it with a cup of DE and none of the DE came through the filter. I hooked up the other filter in series with the larger filter and this has solved my problem but it reduces flow. I have a feeling the larger pump is causing the filter to blow by the smaller particles. with just one filter.

    Would running the filters in parallel reduce pressure enough to solve my problem and improve flow or would it be a waste of time? Also, I have 2" lines running to pump and filter would I need to reduce the smaller filter to say 1.5" line to compensate for the smaller size? Would I need to have two outlet jets or could I "T" them back to the one outlet.

    Or should I bite the bullet and buy a bigger single filter? I would really like to avoid spending that much money however.
    Above ground 9300 gallon pool with intex 3/4 hp pump (way overpowered) and 77lbs sand filter located in Morton, Illinois.

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: New home owner question about double filters

    Welcome to TFP!

    Simply deep cleaning the sand bed of your larger filter might be enough to resolve things for at least a while. That will resettle the sand and get rid of any channeling.

    Plumbing the filters in parallel is fine, as is combining the outputs to one hose/return jet. It does mean extra work cleaning two filters instead of one, and more hose joints that might fail.

    Getting a single larger filter is certainly the best solution, but it is also the most expensive.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    Apr 2015
    Location
    Morton Illinois
    Posts
    14

    Re: New home owner question about double filters

    Thank you for your help!
    Is the size difference between the filters of any real significance?
    Above ground 9300 gallon pool with intex 3/4 hp pump (way overpowered) and 77lbs sand filter located in Morton, Illinois.

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: New home owner question about double filters

    The size difference isn't really an issue in this situation.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Join Date
    Apr 2015
    Location
    Morton Illinois
    Posts
    14

    Re: New home owner question about double filters

    Just did this today. I have probably quadrupled the flow in my pool! All for about 20 bucks in parts. I will update later if the filters actually work well.
    Above ground 9300 gallon pool with intex 3/4 hp pump (way overpowered) and 77lbs sand filter located in Morton, Illinois.

Posting Permissions

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