I have the 14"/1600gph sand filter running on my 15x42" pool (along with the SWG) and it works great. I can't really find much information about the 12" version either.. but it certainly won't hurt anything to go larger.
You do have to cut the holes in the liner a bit bigger to fit the bigger inlet and outlet but it's easy to do... there are no adapters required if you use the inlet and outlet included with the filter. You only need to use an adapter if you have a different set up, like a pool with a skimmer, and that would likely require another adapter that isn't included (to make the connection from the skimmer to the adapter in the box).
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