Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Rehabbing an old pool -- Need recommendation for new pump & filter

  1. Back To Top    #1

    Join Date
    May 2014
    Location
    Oklahoma
    Posts
    6

    Rehabbing an old pool -- Need recommendation for new pump & filter

    Hi, great forum! I've been reading thread after thread the past few weeks and have found tons of helpful & useful information so far. Thanks for the great resource!

    I need some guidance selecting and sizing new equipment for an existing pool. I recently purchased a home with an 20'x40' rectangular in-ground pool w/ auto cover. No exact measurements but I believe it is approximately 35,000 gallons. The pool is a steel wall, vinyl liner pool manufactured by Fox and was constructed in 1990.

    I would like to replace the old Pentair 1/2 HP pump and sand filter. The original equipment looks horrible and I was told hasnt been in operation for 3 years. Here is what I have on the list so far:

    Filter
    Pump
    Timeclock

    I like the idea of running a pump at a slower speed for more hours per day, so I have selected a 2-speed pump. Doing some research online and quickly glancing at pump curves I think a 3/4 HP pump is a good fit.

    More details on the existing piping: There are two skimmers, one main bottom drain, and two returns at the pool. The equipment is a good distance away from the pool, the longest pipe run is about 100 feet & the shortest run is about 70 feet. There is not much elevation change from the pool to the equipment pad, definitely less than 12". There are three 1-1/2" lines entering the equipment pad (2 skimmers + bottom drain) but only one 1-1/2" line from the equipment pad back to the pool. I don't know where this line tees off to the 2 returns. Having the single 1-1/2" return line back to the pool is one reason I didn't go with a larger pump.

    - Is the 3/4 HP 2-speed pump a good choice for this pool?
    - Is the filter I selected too large? I'm concerned about minimum flow rate through the filter when the pump is on low speed.
    - Are there and other common items or accessories that are required to install this pump/filter? I'll do the new PVC piping myself with stuff from the local hardware store.
    - Any different timeclock recommendations? Is the Intermatic linked above the best/easist way to enable 2-speed pump operation?

    Once I have the new pump & filter installed, I plan to completely drain, clean, and refill.

    Thanks!
    20'x40' rectangular in-ground vinyl
    31,300 gallons

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Rehabbing an old pool -- Need recommendation for new pump & filter

    Welcome to TFP!!!

    That pump may infact be larger than you need, a Superflo 1HP 2-speed is smaller and cheaper to buy and run. I do not see any mention of a need for high flow rates.

    You can not really go too large on a filter. There is no such thing as a minimum flow rate for filtration. In fact for the size of your pool, a 72 sqft might be better.

    There is generally no need to have the pump change speeds on a schedule. You could just leave it on low speed and use a simple on/off timer. Then switch to high only when you need it (like for vacuuming, backwashing, etc).

    You can not drain your pool if the liner is more a year or so old as it will shrink and not go back into shape. There is hardly ever a need to drain and refill a pool.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3
    sargent's Avatar
    Join Date
    Aug 2013
    Location
    Tulsa, OK
    Posts
    291

    Re: Rehabbing an old pool -- Need recommendation for new pump & filter

    It is hard to find 2 speed 115 volt pumps, so that Whisperflo may be okay if you need a 115 volt pump, but if your old pump is 230 volt, you should go with a 1 hp 2 speed that is not a Whisperflo. As Jason said, it pumps more water than you need and would therefore be more expensive to run than, for instance, a Superflo.
    14k gal IG vinyl, Jandy Flopro 1 hp up-rated, 2 spd pump, Hayward 325 sq ft cartridge filter, Circupool Si-40 SWCG

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Rehabbing an old pool -- Need recommendation for new pump & filter

    Good point on the voltage differences.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

Posting Permissions

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