Brita On Tap Replacement Cartridge (OPFF-100)
Brita On Tap replacement cartridge (OPFF-100, $18--$25 per cartridge, also available as a 3-pack at $50--$65): 100-gallon life. Available at Target, Walmart, Amazon, and grocery store household sections. Annual cost for a household of 4 using 1.5 gallons of filtered water per day: approximately $100--$130 in replacement cartridges. Note: the Brita On Tap cartridge (OPFF-100) is NOT the same as the Brita pitcher filter cartridge (Standard or Longlast+) -- they are different products and not interchangeable. Brita customer service: 1-800-242-8269 for compatibility, warranty, or cartridge questions.