Cartridge – 120 day lemon (summer orange) for optimum 4000

Cartridge – 120 day lemon (summer orange) for optimum 4000

CARTRIDGE – 120 DAY LEMON(SUMMER ORANGE) FOR OPTIMUM 4000

Series Optimum 4000 Replacement Cartridge Available in Standard (90-day) or High-Output (120-day) varieties.