TOREAD Relacement for Spa Filter PRB35-IN, Unicel C-4335, Guardian 409-219, Filbur FC-2385, 03FIL1300, 17-2482, 25393, 303557, 817-3501, R173431, 35 sq.ft, 5 X 9 Drop in Hot Tub Filter, 1Pack

• 【NSF/ANSI 50 CERTIFIED】 TOREAD Pool and Spa filter is tested and certified by IAPMO against NSF/ANSI 50. The filter with certified safe materials provides you with clean, fresh and clear water. Only select certified filters for your family to ensure the safety, health and happiness of your loved ones. 【SPECIFICATIONS】 Length: 9 1/4”. Outside Diameter: 5”. Top /Bottom Opening: 2 1/8”. Filtration Area: 35 Sq.ft. Filter Material: Trilobal Filtration Fabric. 【REPLACEMENT MODELS】TOREAD TRF-4335 filter compatible PRB35-IN, Unicel C-4335, Guardian 409-219, Aladdin 13501, SD-00198, SD-00659, Rainbow Dynamic 35, Waterway 35 In-line. NOTE: This is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only. TOREAD is an independent brand. 【REINFORCEMENT STRUCTURE】With 25% thicker filtration fabric, heavy chlorine resistant and break-resistant end caps and reinforced center support, the filter delivers high powered propulsion flow, and crystal clear water, providing you with a relaxed and healthy enjoyment. 【MORE EFFICIENT FILTRATION AREA】Uniformity and high-performance trilobal fabric has 21-40% higher capacity compared with common point-bond fabric. The trilobal shape of fabric fibers also helps catch particles, increases efficiency without the pressure drop penalty, and helps reduce filter cleaning frequency. 【EASY TO CLEAN】The Trilobal Fabric Structure filter material makes it easy to release impurities when cleaning the filter, the filter is like a new one after cleaning. It is recommended that you clean cartridges every 2 weeks to maximize your spa's performance.