Grohe Blue Filter Cartridge and CO2 Cylinder Replacement
Grohe Blue filter cartridge (Grohe 40412001, $35--$55): replace every 600 liters (approximately 160 gallons or 3--4 months for a household that drinks 1--2 liters of filtered water per day). Annual filter cost: $140--$220 -- significantly higher per gallon than any traditional pitcher or under-sink filter. The Grohe Blue filter cartridge is proprietary and only available through Grohe dealers, Williams-Sonoma, Amazon, and grohe.com. CO2 cylinder (600g cylinder, $15--$20): lasts approximately 60 liters of sparkling water -- approximately 1--3 months depending on usage. CO2 cylinders are available at Williams-Sonoma, online via Amazon, and at Grohe dealers. Exchange cylinder programs reduce CO2 cost by approximately 30%.