I have a 40ft well that has good water but I keep getting fine sand in my toilet tank. I know I need a filter but I don't know what to get. It has a new pump and the well was cleaned out. I get 10gpm and don't want to lose any water pressure.We live in a very small community and have had suggestions of filters from hardware stores for $50 to $500 for sand separators. I know a lot has to do with size of particles removed and gpm but I don't know the pros and cons. We have never dealt with a well before, any help is greatly appreciated.