SunSun HW-404B External Canister Filter with 9W UV Sterilizer User Manual

1. Product Overview

The SunSun HW-404B is a 5-stage external canister filter designed for aquariums up to 150 gallons. It provides comprehensive mechanical, chemical, and biological filtration, processing up to 525 gallons per hour. This model includes an integrated 9-watt UV sterilizer to assist in controlling algae spores and bacteria, contributing to clearer water. The filter features a self-priming pump for simplified startup.

Figure 1: SunSun HW-404B External Canister Filter product packaging.

2. Safety Instructions

• Always disconnect power to the filter and any other aquarium equipment before performing maintenance or handling the unit.
• Ensure the filter is placed on a stable, level surface below the aquarium water level to facilitate proper operation and priming.
• Do not operate the UV sterilizer if the UV lamp is damaged or exposed. Direct exposure to UV light can be harmful to eyes and skin.
• Verify all hose connections are secure to prevent leaks.
• This appliance is for indoor use only.
• Refer to the user manual provided in the product details section for information regarding product assembly, usage, and troubleshooting.

3. Package Contents

Carefully unpack all components and verify that the following items are included:

• SunSun HW-404B Canister Filter Unit
• Filter Pads (various grades for mechanical filtration)
• Hoses (Inlet and Outlet)
• Input and Output Devices (Spray Bar, Input Bar, etc.)
• UV Lamp (9W)
• Flexible Media Trays (4 units)
• Connection Accessories (Suction Cups, Clamps, etc.)

Figure 2: Diagram illustrating the various components included with the filter.

4. Setup Instructions

Follow these steps for initial setup and installation:

1. Prepare the Filter Head: Unclip the buckles (1) and (2) from the main body of the filter. Carefully lift the filter head to separate it from the base.
2. Install Filter Media: The four flexible media trays allow for customized filtration. Place coarse filter pads in the bottom tray, followed by finer pads. Add chemical or biological media (e.g., activated carbon, ceramic rings, bio-balls, sold separately) to the upper trays as desired. Ensure media is arranged to allow water flow from bottom to top.
3. Reassemble and Connect Hoses: Secure the filter head back onto the main body. Push the inlet and outlet taps into the filter head and fasten using the screw caps. Attach the hoses to each tap and secure them.
4. Connect to Aquarium: According to the provided diagram, attach the input downpipes and output spray bars to the hoses and position them within your aquarium. Ensure hoses are cut to appropriate lengths to avoid kinks or sags.
5. Priming the Filter: The HW-404B features a self-priming pump. Fill the canister with aquarium water to the top of the upper tray before attaching the head. Press the blue primer button several times until water begins to flow through the hoses. Once water is flowing, plug in the filter. Gently rock the unit side to side to release any trapped air.
6. UV Sterilizer Activation: The switch for the 9W UV sterilizer is located on the side of the filter head. Turn it on if desired. A small indicator light confirms operation.

Figure 3: Visual guide for filter operation and UV lamp replacement.

Figure 4: The SunSun HW-404B filter unit with inlet and outlet hoses connected.

5. Operating Instructions

Once installed and primed, the filter will begin circulating and filtering aquarium water. The UV sterilizer can be operated independently.

• Power On/Off: Plug the filter into a suitable power outlet to begin operation. Unplug to turn off.
• UV Sterilizer: The 9W UV sterilizer can be switched on or off as needed. It is effective for controlling free-floating algae and bacteria. Continuous 24/7 operation is generally not required and may reduce the lifespan of the UV lamp and potentially degrade plastic components over extended periods. Consult aquarium care guidelines for optimal UV usage.
• Flow Rate: The filter is rated for 525 GPH (2000 L/hr) without media and at zero head pressure. Actual flow rates will vary depending on the amount and type of filter media used, hose length, and height difference between the filter and the aquarium.

6. Maintenance

Regular maintenance ensures optimal performance and longevity of your filter.

6.1 Cleaning the Filter

1. Disconnect Power: Always unplug the filter from the power outlet before cleaning.
2. Turn Off During Water Changes: To prevent the filter from running dry and requiring re-priming, turn it off during aquarium water changes.
3. Disassemble: Close the inlet/outlet valves, disconnect the hoses, and unclip the filter head.
4. Clean Media Trays: Remove the media trays. Clean mechanical filter pads by rinsing them gently in a bucket of old aquarium water (not tap water, to preserve beneficial bacteria). Clean biological media lightly if necessary, also using old aquarium water.
5. Clean Impeller: Inspect and clean the impeller and its housing for any debris or blockages.
6. O-Ring Maintenance: Inspect the main O-ring on the filter head for wear or damage. Apply a thin layer of silicone lubricant (e.g., Vaseline) to the O-ring to maintain a good seal and ease of removal/insertion.
7. Reassemble: Reassemble the filter in reverse order, ensuring all trays are correctly seated and the head is securely clipped.

6.2 UV Lamp Replacement

The UV lamp has a limited lifespan and should be replaced periodically (typically every 6-12 months) to maintain effectiveness.

1. Disconnect Power: Ensure the filter is unplugged.
2. Access UV Chamber: Refer to the diagram (Figure 3) for specific instructions on accessing the UV lamp chamber. This typically involves opening a cover or unscrewing a component.
3. Remove Old Lamp: Carefully remove the old UV lamp. Handle with care as it may be fragile.
4. Install New Lamp: Insert the new 9W UV lamp into its socket. Ensure it is seated correctly.
5. Reassemble: Securely close the UV lamp chamber cover.

7. Troubleshooting

If you encounter issues with your SunSun HW-404B filter, consult the following common problems and solutions:

8. Specifications

9. Warranty and Support

The SunSun HW-404B External Canister Filter comes with a 180-day warranty, which excludes the UV lamp. For warranty claims, technical assistance, or to order replacement parts, please contact SunSun customer support through your retailer or the official SunSun website.