SunSun HW-604B series filters are due to the fact that the pump was placed outside the filter to increase the space of the filtering materials.
An energy-efficient pump (consumption 14 W) ensures trouble-free operation of the filter. The pump capacity of 800 liters per hour makes it possible to use filters in aquariums with a volume of up to 200 liters.
- Brand Name:SUNSUN
- Maximum lift.:1.5M
- Maximum flow:800L/H
2 things you need to know, 1> The outlet size is different from the regular 603B, outlet here is 16mm, so you would need a 12mm to 16mm connector, and 2> the pump emits a slight humming sound, so if you are planning to keep this for your bedroom tank, it will be audible at night.
The flow on the other hand is great. Really gets the job done for nano tanks (i have mine set up on an 8gallon densely planted tank and it filters nicely.
I use only the black sponge as the 1stlayer, and then 1L ADA Bio as the 2nd layer.