Product Description
Enhance Your Aquarium with the SunSun HW-603B External Canister Filter
Experience efficient filtration and a healthier aquarium environment with the SunSun HW-603B External Canister Filter. Designed for smaller aquariums, this compact filter offers powerful performance and easy maintenance.
Key Features:
- Optimal Filtration for Smaller Tanks: Ideal for aquariums up to 120 liters, providing efficient filtration for your fish.
- Versatile Media Trays: Customize your filtration with three flexible media trays that accommodate a variety of filtration media, including ceramic rings, activated carbon, and bio-balls.
- Mechanical, Biological, and Chemical Filtration: Achieve comprehensive water purification by removing debris, harmful substances, and promoting beneficial bacteria growth.
- Compact Design: Save space in your aquarium setup with this small and efficient filter.
- Easy Installation and Maintenance: Set up effortlessly and enjoy convenient cleaning with a self-priming pump and easy-access filter media trays.
- Suitable for Freshwater and Saltwater Aquariums: Ideal for both freshwater and marine environments, providing optimal filtration for a wide range of aquatic life.
Benefits of Canister Filters:
- Superior Filtration: Canister filters offer exceptional filtration capabilities, ideal for smaller aquariums.
- Flexibility: Customize your filtration with a variety of media options to address specific needs.
- Efficient Water Flow: High water pressure ensures thorough filtration and optimal circulation.
- Easy Maintenance: Regular cleaning and maintenance are simplified with a user-friendly design.
- Quiet Operation: Enjoy a peaceful aquarium environment without disruptive noise.
Installation Guide:

- Remove the Cover: Pull up the four clips in the direction of the arrows (Pic 1), separating them from the cover (Pic 2).
- Separate the Main Body: Hold the main body and gently pull upwards, detaching the cover from the main body (Pic 3).
- Customize the Filter Media: If you don’t need the sponge, you can replace it with other filter media according to your preferences. Ensure the filter media is properly positioned and closed in the opposite direction of the bottom filter board (Pic 4).
- Attach the Cover and Clips: Place the cover back on and press it firmly. Then, fasten the four clips (Pic 5).
- Connect the Inlet and Pump: Insert the inlet into the cover and place the water pump at the bottom of the main body. Securely screw these two components together (Pic 6).
- Ensure Proper Alignment: Verify that the O-rings and switches are in their correct positions (Pic 7).

Filling the Filter for the First Time:
Method 1: Siphon Method:
- Connect the green hose to the inlet and water pump.
- Forcefully suck the inlet hose to create a siphon effect, filling the hose and bucket with water.
- Install the remaining spare parts (Pic 8).
- Important: The outlet hose must be submerged in water during the siphoning process, and the bucket must
- be lower than the tank water level.
Method 2: Manual Filling:
- Fill the bucket with 3/4 of the water.
- Place the cover on the tank and turn on the power.
- Important: Ensure the filter is at the same level as the tank before starting the filter.
By following these steps, you can easily install and set up your filter for optimal performance.
Invest in the SunSun HW-603B External Canister Filter and experience the difference. This compact and efficient filter will provide your aquarium with the filtration it needs to thrive, ensuring a healthy and vibrant aquatic ecosystem.
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