For anyone who's followed the story so far: Homeowner - 0, First American Home Warranty Co - 1
They're denying my claim because the old filter was repaired "improperly" (ie. epoxy) by the previous homeowner, instead of having the (obsolete, not available) part replaced. On the plus side, I get to put in whatever filter I want. On the negative, I also have to pay for it.
I've studied the different types and I'm leaning toward sand or DE - more towards sand. From what I've read, it looks like there's less maintenance with sand and no hazmat DE.
Pool size ~13000 gal. I have a whisperflo 1 1/2 hp pump. I've used the hayward pump/filter sizing worksheet http://www.haywardnet.com/pdfs/Pump_filter_sizing.pdf to come up with a 22-27 GPM turnover rate (8-10 hour). Based on the worksheet, I have about 36 ft of head. In this post, http://troublefreepool.com/viewtopic.php?t=2581, Dave suggested using 45 ft of head to calculate pump GPM.
Based on Pentair's pump curves for this model 45 ft of head = 118-120 GPM and w/ 36 ft of head = 130 gpm
That seems grossly oversized for this pool, but I understand the $$$ incentive of pool stores to "upsell" stuff.
In that same post Dave says:
When I look at the technical specifications for Hayward Sand Filters (just an example, haven't settled on brand or type) it seems like I'd have to get a HUGE filter.Your filter size should be in relations to your pump's capacity to push your water. If your pump is rated somewhere around 50-70gpm, a filter size about 20% bigger than that would be okay. Larger filters are generally better. For sure, do not get one rated less than your pump.
Am I misunderstanding pump/filter sizing guidelines? Do I need a smaller pump?
What filter types (cart, sand, DE) do you folks like (and why)?
What brand & model would you recommend?