REPLACEMENT MODELS: Compatible with PDM 28, 461273, 2015 & Newer AquaRest DreamMaker Cottage Collection models (not oval end). Note: All manufacturers' names and part numbers remain the property of their respective holder(s) and are used for compatibility information only. Wowreed is an independent brand. SPECIFICATIONS: Length: 7 1/4"; Outside Diameter: 5 1/2"; Top/Bottom Opening: 3''; Filtration Area: 28 sq. ft. EASY TO CLEAN: This filter utilizes fabric structure design so as to make the impurities easy to be released and washed. It is recommended to wash the filters every 2-6 weeks in order to maximize the performance and capacity of it. In addition, our premium filter material keeps your water clearer and easier to clean. LONG LIFE: The filters are with solid end caps, good material and bands, which can be used repeatedly. Longevity and endurance are ensured. SERVICE: If there is any question, please let us know! We promise a good shopping experience with our reliable control and testing. Spa Filter Compatible with PDM 28, 461273,2015& Newer AquaRest DreamMaker Cottage Collection models(not oval end),2 pack