The Hydro 25 R is a compatible replacement for the following pool and spa filters:
The Hydro Spas 25 Square Ft. Comp. Pool and Spa Filter has top and bottom open holes with diameters of 2 1/8 inches. This pool filter replacement has a diameter of 4 15/16 inches and a length of 13 5/16 inches. This Hydro Spa filter will keep the water in your pool or spa clean and clear.