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The Filbur 21-23401 is the correct compatible replacement for the following pool and spa filter:
The Filbur 21-23401 1 Micron Pool/Spa Water Filter is made of high quality, durable pleated polyester media. This Filbur pool filter cartridge filters particles down to 1 micron to keep your pool and spa water clean and crystal clear. This 1 micron sediment pool filter has a diameter of 2 3/4 inches and a length of 19 1/2 inches. This pleated pool filter cartridge features end caps made of Plastisol.
The Filbur 21-23401 specifications: