Ultraklean Pressurized Filter, Includes A Ultraviolet Light For Crystal Clear Water, For Ponds Up To 500 Gallon, Filter Accepts 3/4" Up To 1-1/2" Kink Free Tubing For Ultimate Versatility, May Be Buried In The Ground Up To The Color Ring, This Makes Cleaning Easy & Gives You The Ability To Hide The Filter In The Landscape, It's Unique Triple Action Foam Media & Cyclonic Action Means Less Cleaning Is Needed During The Season, It Is Also Equipped With A State Of The Art Led Indicator System To Let The Owner Know When It Needs To Be Maintained.