Water Filter Cartridges
Replacement water filter cartridges are matched to the system they fit, so check the brand, model and cartridge size before ordering. Changing them on time keeps flow rates up and keeps certified contaminant reduction valid, which only applies within the rated gallons or months.
Typical change intervals
- RO pre-filters: sediment and carbon every 6 to 12 months, and the membrane every 2 to 3 years.
- Whole house cartridges: sediment every 3 to 6 months, carbon every 6 to 12 months. Tank systems last years.
- Under sink carbon: 6 to 12 months or the rated gallons.
- Pitcher filters: about 2 to 6 months, depending on type.
- Housing sizes: whole house cartridges come in 10- and 20-inch lengths and standard or "Big Blue" 4.5-inch diameters.
- Sanitize: clean housings and replace O-rings when changing.
Shop Reverse Osmosis Replacement Filters, Whole House Replacement Filters and Pitcher Replacement Filters.
FAQs
How often should I change my water filter cartridge?
It depends on the type: RO pre-filters every 6 to 12 months and membranes every 2 to 3 years, whole house sediment cartridges every 3 to 6 months, carbon every 6 to 12 months, and pitcher filters every 2 to 6 months. Change sooner if flow drops or taste returns.
How do I know what size whole house cartridge I need?
Measure the cartridge or check the housing label. Common sizes are 10 or 20 inches long, in standard 2.5-inch or Big Blue 4.5-inch diameter. Match the micron rating and media type, such as sediment or carbon, to the original. Most housings are marked with the size on the cap.
Can I use compatible cartridges in my RO system?
Many RO systems use standard-size cartridges, and compatible options exist. Proprietary twist-off cartridges, such as on many tankless systems, usually require genuine parts. Using non-certified cartridges may change the contaminants your system reduces, so check certification when it matters, and keep the old part numbers handy.
