Elive CleaRO Reverse Osmosis Carbon Cartridge, Fish Tank Replacement Cartridges for Aquarium Filtration System Healthy Fish: ClearRO helps to keep the aquarium water quality top notch when your tap water isnt Easy Swap: The Cartridge can be replaced in a matter of seconds. No installation required. Long Lifetime: Operating life up to 1500 gallons (Approximately 6 Months) depending on water quality Great Water Quality: Removes chlorine reliably from incoming tap water supplies Fits Many Systems: Elive RO Cartridges work for Elive ClearRO 50 & 100 and systems like the Aquatic Life RO Buddies filters