Secure, online ordering, and to-your-door-delivery - it's a snap to order Honeywell-compatible reverse osmosis kit # 32006450.
Honeywell recommends replacing the RO Membrane and Chlorine filers every 2 to 3 years of operation. (Depending on usage and water quality)
The chlorine filters (32006451-001) should be replaced every year (3 to 6 months of operation.)