Elive CleaRo 50 Gallon per Day Aquarium Fish Tank Water Filter; 3 Stage Reverse Osmosis System, Cartridges Included Healthy Fish: ClearRo helps to keep the aquarium water quality top notch when your tap water isnt. Easy Installation: The filter comes mostly assembled and all necessary clips and tubing is included Less Aquarium Maintenance: The CleaRo improves the water quality so much, it greatly reduces nuisance algae growth. Up to 4 Stage Filtering: The Filter comes with 3 Stages and can even be upgraded to 4 if needed with the Mixed Bed Resin Cartridge . Compact & Easy Installation: Can easily be installed and used in small areas or under cabinets.