The hw 304b has a built in 9 watt uv sterilizer to help kill algae spores and bacteria promoting crystal clear water.
External canister filter with uv light.
Polar aurora 4 stage external canister filter 525gph with 9 watt uv sterilizer new 525gph prime.
The uv light kills suspended algae that pass through the filter.
Penn plax marlin canister filt uv sterilizer and regular models.
Set it up and it has been running for about 24 hrs and my tank is crystal clear.
External 4 1 stage canister filter with built in uv sterilizer.
Polar aurora 4 stage external canister filter with 9 watt uv sterilizer 525 gph with.
Only 13 left in stock order soon.
The sunsun 4 stage external canister filter with 9 watt uv sterilizer is a great buy for the money.
Marineland magniflow canister filter for aquariums fast maintenance 4 2 out of 5 stars 1 499.
Sunsun hw 404b 525 gph 5 stage external canister filter with 9w uv sterilizer white 4 0 out of 5 stars 210.
Sunsun hw 304b 525 gph 5 stage external canister filter with 9 watt uv sterilizer.
When exposed to ultraviolet light the algae cells are killed.
Filter is capable of handling up to 525 gallons per hour with 4 flexible media trays that allow you to add your media of choice.