SOBO WP-303H Hang-On Filter Overview

The SOBO WP-303H is a compact hang-on-back (HOB) filter designed for small to medium-sized aquariums. It's a popular choice for beginners and hobbyists seeking efficient, quiet, and easy-to-maintain filtration.

🔧 Specifications

• Model: SOBO WP-303H

• Power Consumption: 5 Watts

• Flow Rate: Approximately 280 Litres per Hour (L/H)

• Voltage: AC 220–240V, 50/60Hz

• Ideal Tank Size: Up to 40–50 Litres

• Dimensions (Approx.): 16 × 14 × 8.5 cm

• Placement: Hang-on at the back of the aquarium

✅ Key Features

• 3-Stage Filtration:

  • Mechanical: Sponge to trap debris and waste

  • Chemical: Activated carbon (if included) to remove odors and discoloration

  • Biological: Space for beneficial bacteria to grow

• Surface Skimmer: Helps in removing oil film from the surface (may vary by region/model)

• Adjustable Flow Rate: Allows control over water circulation

• Energy Efficient & Quiet: Low power usage with minimal noise, suitable for indoor use

• Easy to Install: Simply hang on the back of your aquarium and plug in

• Transparent Filter Box: Helps in monitoring media clogging or dirt accumulation

🧼 Maintenance Tips

• Clean the sponge filter weekly or biweekly to prevent clogging and flow reduction

• Replace activated carbon every 3–4 weeks if used

• Rinse all parts in tank water during cleaning to preserve beneficial bacteria

• Check impeller regularly for debris and smooth spinning

💡 Pros

• Compact and space-saving design

• Suitable for small aquariums

• Easy to maintain and assemble

• Quiet operation

• Economical pricing

⚠️ Cons

• Not suitable for tanks larger than 2 feet or over 50 liters

• Filter media capacity is limited compared to larger external filters

• May need to prime manually if water level drops below intake

📦 Box Contents (Typically Included)

• Filter body with motor

• Sponge filter media

• Activated carbon or bio media (optional or regional)

• Intake tube and connectors

🔄 Alternative Models in Same Series

The SOBO WP-303H is a budget-friendly and efficient filter perfect for small aquariums and beginners. Its easy-to-use design, silent operation, and reliable performance make it a favorite among hobbyists maintaining nano tanks, betta setups, or shrimp tanks.