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:
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.