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The Filbur 30-23420 is the correct compatible replacement for the following pool and spa filter:
The Filbur 30-23420 20 Micron Pool/Spa Water Filter is constructed with high quality, durable pleated polyester media. This Filbur pool filter cartridge replacement includes end caps made of Plastisol. This Filbur pool filter replacement reduces particles in water down to 20 microns to keep your pool and spa water clean and crystal clear. This 20 micron pool water filter has a diameter of 2 3/4 inches and a length of 29 1/4 inches.
The Filbur 30-23420 specifications: