Think Crucial 1 Replacement for Unicel Pool Filter Fits C-4326, Pleatco PRB25-IN, Filbur FC-2375 & Rainbow Dynamic 25, Fits Multiple Pools & Spas EXTREMELY DURABLE so when you insert your filter into your pool, it doesn't break or cause you to purchase anything extra besides changing your filter every 12-24 months. HEALTHIER LIVING because you're keeping your pool water incredibly clean. This filter is comparable to Unicel C-4326, Pleatco PRB25-IN, Filbur FC-2375 & Rainbow Dynamic 25 and it fits QCA, Rainbow, Rec Warehouse, River Valley Spas, Royal Spas, Rubadub Tub, Safari Spas, Savannah Spas, Signature Spas, Spa Manufacturers Inc., Statewood Spas, Streamline Spas, Sun Ray Spas (Canada), Thermo Spas of Connecticut, Tiger River, US Spas, Viking Spas, Waterway Plastics, & Zone Spas. PREMIUM FILTRATION when you swim in your Accent Spas, Acryx-Maax Spas (Canada), Apollo Spas, Aqua Mystic, Arctic Spas, Aquatic Industries, Beachcomber, Blue Falls Mfg, Custom Mold, California Cooperage, Coast Mountain Spas (Canada), Coleman Spas, Dakota Spas, Emerald Spas, GPM industries, Great Lakes Home & Resort, Great Lakes Spas, Great Northern Engineering, Honey Tubs, Hot Spot, Waters Edge Spas, Watkins Mfg., Infinity Spas by Maax, Islander Spas, Jacuzzi Premium, & Hot Spring Spas. INCREDIBLY SIMPLE TO USE because there is basically only one step! Take out your old filter and insert your new filter. Done! This filter fits in the above listed pools & spas AND Leisure Bay MFG, Lifestyle Spas, Maax spas of az, Moonwater Spas, Nordic Hot Tubs, Orca Bay Spas, PDC Spas, & Pentair Pool Products. GUARANTEED SATISFACTION because of a 30 day full money bank guarantee and a trusted Think Crucial warranty. We are so confident in our products that we have no problem giving you every penny back if you're unhappy with your purchase. You won't see promises like that from big box brands!