New to this forum.. Was hoping to get some advice on what sized pool to get. I know I want round, but not sure if an 18' x54" would work.. Mostly it will be 4 of us here, 2 adults and 2 kids, sometimes 3.. I may want to entertain a fairly small group of 10-12 people and not sure how many people could comfortably fit in a 18' round x 54" deep pool.. Would a 21' be that much better? I don't anticipate all 12 people in the pool at one time however would like to see what a 18' versus 21' could hold. Thank you!