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The Filbur 21-23420 is the correct compatible replacement for the following pool and spa filter:
The Filbur 21-23420 20 Micron Pool/Spa Water 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 water filter cartridge filters particles down to 20 microns to keep your pool and spa water clean and crystal clear. This 20 micron pool filter has a diameter of 2 3/4 inches and a length of 19 1/2 inches.
The Filbur 21-23420 specifications: