HW‑603B – external filter

The SunSun HW-603B suits freshwater and marine aquarists who want a compact external filter for tanks of 70 to 150 litres. Its 400 l/h pump keeps water moving and removes debris, so the tank needs less manual maintenance. The 165 x 165 x 255 mm body can be placed inside a cabinet, which keeps the setup out of sight.

Why it matters

• Three-stage filtration: the kit includes 3 sponges, filter fleece and bio balls, covering coarse debris, fine suspended particles and biological media.
• Flexible role: the manufacturer states the unit can run as the main filter in a smaller tank or as a prefilter that reduces the load on a larger system.
• Low power draw: the pump consumes 6 W at 400 l/h.
• Ready to connect: the set includes the canister with lid, pump, 2 x 150 cm hoses (12/16), hose fittings with valves, and water inlet and outlet.

Specifications

• Model: SunSun HW-603B
• Power consumption: 6 W
• Flow rate: 400 l/h
• Recommended aquarium volume: 70 to 150 l
• Canister capacity: 2700 ml
• Filter dimensions: 165 mm x 165 mm x 255 mm
• Hoses: 2 x 150 cm (12/16)
• Weight: 1.71 kg

What it works with

The HW-603B fits planted and fish-only freshwater tanks in the 70 to 150 litre range, where its 400 l/h flow matches the volume. Used as a prefilter, it can work alongside a larger filtration system to handle heavier loads. Its compact footprint makes it a practical choice for setups where the filter must stay hidden in a cabinet.