Attaches to the end of any garden hose|Extends filter life|Removes solids from the water|Reduces hard mineral deposits|Easier to balance chemicals from the start Purify the water before filling the spa with the Great Start Filter. This pre-filter is 90% efficient and removes the following contaminates; dirt sediment rust calcium iron and copper. Attach the Great Start Filter to the end of any garden hose and begin the fill... its that simple! SKU:BMW25731189