Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: Thoughts on sand filter plus cartidge

  1. Back To Top    #1

    Thoughts on sand filter plus cartidge

    Hey guys I'll be doing some plumbing with a pool make over and have a few ideas. First off I've got a bunch of pumps and all items discussed I already have laying around.
    Pool is 16x24 doughboy 48" deep, 10,000 gallons. Previous owner's setup Hayward 16"sand filter, 1.5hp pump was told it only holds 50lbs, not the 100 per instructions, nice people though! Currently single skimmer and return.
    1st off I plan to swap in my 3/4 hp flowtec. I want to add a 2nd skimmer and at least 1 or more returns. Should there be any concern about number returns for a pump this size? --pool cleaner is hayward aquabug 500.
    2nd I have a Intex 1500gph "wetset" 4 amp rated nameplate, I think 1/3 hp with a built in cartridge filter. I could add this in parallel, (won't run at the same time) gain extra filtration, redundancy, use a little less power, maybe less backwashing too? This pump worked great on my 15' round Intex running 8hrs a day.
    3rd Any opinions on return jets, like rotating spa style? I'm thinking about one to help stir things off the bottom and or near the stair area. We get lots of leaves...

    Thanks!
    Doughboy 16x24' Semi inground -in progress, Hayward 210 sand filter w/ Flotec 3/4 Hp.

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Thoughts on sand filter plus cartidge

    Your 3/4 hp pump will be fine. I'd upgrade that sand filter to a larger model and wouldn't waste time plumbing the cartridge at all. JMO.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Re: Thoughts on sand filter plus cartidge

    Won't a cartridge filter smaller particles?
    When the only tool you have is a hammer everything starts looking like a nail.
    Doughboy 16x24 "Aboveground Inground" in progress...

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,347

    Re: Thoughts on sand filter plus cartidge

    Unless you're going to install a lot larger cartridge you'll be limiting your filtering capacity. You most likely won't notice the difference in the pool.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  5. Back To Top    #5

    Re: Thoughts on sand filter plus cartidge

    Agreed. Dump the Cartridge filter (or manual backwash filter) and go with the sand.

    Cartridge will filter finer but you cant backwash. Pools need fresh water in them to get rid of UTDS and backwashing and getting new water into the pool is a great way to do this.

    Keep it simple.

  6. Back To Top    #6

    Revisited, Hayward c751 and bigger sand filter

    I understand simple, BUT, there's no kill like overkill! Well, 2 things have changed, 1st I was wrong about my sand filter, its the 21" Hayward 210. 2ndly I picked up a Hayward c751 cartridge filter at a yard sale today spare 1hp pump included. How about now? Poor man's 3 speed, 1 3/4 hp when needed. Plumbing, if I have a dedicated pump for each filter do I just run them parallel? Is there any need for check valves?
    Doughboy 16x24' Semi inground -in progress, Hayward 210 sand filter w/ Flotec 3/4 Hp.

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Thoughts on sand filter plus cartidge

    Running two filters, or two pumps, in parallel from a common suction pipe and common return pipe is problematic at best. Unless the pumps are perfectly matched the larger pump will tend to put back pressure on the smaller pump reducing it's flow rate so much that it will be essentially useless. Similar issues come up when putting two filters in parallel on a single pump. If you have independent suction and return plumbing for each pump/filter then all is good.

    If you are dead set on making things over complicated, then put the two filters in series, sand first and cartridge second.
    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

  8. Back To Top    #8

    Re: Thoughts on sand filter plus cartidge

    why not run them at separate times. 5 hrs sand pump then 5 hrs cartridge. There will be 2 skimmers and at least 2 returns, hadn't considered not connecting them, but its easy to not connect them. My thoughts are for the little effort of installing these pieces I already have, I'll cut filter maintenance in half including backwashing, gain a little extra filtration over just sand and have redundancy in case of failure.
    Doughboy 16x24' Semi inground -in progress, Hayward 210 sand filter w/ Flotec 3/4 Hp.

  9. Back To Top    #9
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Thoughts on sand filter plus cartidge

    Running one half time and the other half time won't improve anything. Each filter will need half as much maintenance, but there are two of them, so it works out to just as much work. Also, the quality of the filtering won't be as good as if you just used the cartridge filter. Basically you will have twice as many things that can break, leading to more trouble in the long run.
    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

Posting Permissions

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