Air Wash PCO Filter 20x25x4 is a direct replacement for the 4 inch High Efficiency Filter in the Air Wash PCO Filter. Should your filter differ in size or dimensions contact us to insure you receive the correct replacement filter. Other options are 16x25x4 and 14x25x4.
The Air Wash PCO Replacement Filter 4 inch High Efficiency Filter should be changed at the beginning of each season, depending on usage.
Replacement 24" UV Bulbs should be replaced every 24 months.