I'm getting an 18' round x 52 inch high above ground pool. I am getting a 1 HP pump and 1 HP filter. This is plenty for my pool size????
Filters are not normally rated in HP. But without knowing the model # of either, it is hard to say. Are they the same as what is in your signature? Do you have a link to the equipment?1 HP filter
I will stick by what has been said about filter size. Get the biggest you can afford. 100lbs of sand will have you backwashing probably twice a month, where a 22" or 24" that holds 200- 300lbs will be more like twice a season.