The SunSun HW-704B External Aquarium Filter system utilizes a multi-stage approach to filtration. Filtering aquarium tank water through four (4) internal layered baskets filled with assorted filter media material provides extremely thorough biological, mechanical and chemical filtration. This Canister draws water into the filter through an inlet tube and returns crystal clear water via an outlet tube (both supplied). The outlet tube is fitted with a spray-bar to help increase oxygen aeration levels within your tank.
Stage 1: mechanical / biological filtration
Stage 2: mechanical / biological filtration
Stage 3: chemical filtration (activated carbon, turf, phosphate Ex etc.)
Stage 4: chemical filtration
Stage 5: UV sterilizer