IN STOCK Orders paid on or before 2PM Mountain Time Mon-Fri will ship same day, through UPS ground. WE ARE 1 OUT OF 3 AUTHORIZED ONLINE RETAILERS BY WATER INC, THE REST OF THE SELLERS ONLINE WILL VOID YOUR WARRANTY AND SERVICE FROM WATER INC. WI-HP-SECURE-.75C Replacement Filter Cartridge for HousePure Secure Tankless Water Heater Protection Filter System. (In Stock) Replacement filter cartridge for HousePure Secure 3/4-Inch tankless water heater filter system. The 5-micron filter with polyphosphate scale reducing media provides consistent flow rates and superior filtration performance. Recommended for all Tankless Water Heater manufacturers. Tested to NSF/ANSI Standard 42 for material requirements The HousePure Secure cartridge should be changed annually or when flow gauge indicates a change is needed sooner. Replacement filter cartridge for WI-HP-SECURE-.75 Filter System Utilizing Siliphos Polyphosphate Capacity: One year or when flow gauge indicates change needed Dimensions: Height: 20-inches Diameter: 2.5-inches Included Parts: Replacement lubricated o-ring and filter change indicator. MAXIMUM recommended line pressure for this product is 75 PSI. Pressure above 75 PSI indicates the absence of a properly functioning water pressure regulator at the property. Excessive water pressure poses a risk of property damage to you. Problems due to excessive water pressure are NOT covered by this product's warranty. WI-HP-SECURE-1.5C Replacement Filter Cartridge for HousePure Secure Tankless Water Heater Protection Filter System. Will be arriving within 7-10 business days to you, thank you your patience!