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The Filbur 31-23450 is the correct compatible replacement for the following pool and spa filter:
The Filbur 31-23450 30" 50 Micron Pool/Spa Filter is made of high quality, durable pleated polyester media. This Filbur pool filter cartridge replacement features end caps made of Plastisol. This Filbur pool filter replacement filters particles down to 50 microns to keep your pool and spa water clean and crystal clear. This 50 micron pool water filter has a diameter of 2 3/4 inches and a length of 30 inches.
The Filbur 31-23450 specifications: