The Blue Pet BLH-401 Hang On Filter is a high-efficiency HOB (Hang-On-Back) aquarium filter designed for small to medium-sized aquariums. It provides multi-stage filtration (mechanical, biological, and chemical) to keep aquarium water clean, clear, and healthy for fish and aquatic plants.

This external filter hangs on the back of the tank, saving internal space while delivering continuous water circulation and natural oxygenation.

⚙️ Key Specifications

• Model: Blue Pet BLH-401
• Type: Hang-On-Back (HOB) Aquarium Filter
• Power Consumption: ~5W–8W (approx.)
• Flow Rate: ~400–600 L/H (varies by setup)
• Voltage: 220–240V / 50Hz
• Filtration Type: Mechanical + Biological + Chemical
• Suitable Tank Size: ~50L – 120L (approx.)
• Installation: External (hang-on aquarium rim)

🌊 Filtration System

1. 🧼 Mechanical Filtration

• Removes dirt, debris, and fish waste particles
• Uses sponge and filter pads for cleaning

2. 🦠 Biological Filtration

• Supports beneficial bacteria growth
• Breaks down ammonia and nitrite for a stable ecosystem

3. 🧪 Chemical Filtration

• Activated carbon or filter media
• Removes odor, discoloration, and toxins

4. 🫧 Oxygenation Effect

• Water return creates surface agitation
• Improves oxygen levels in aquarium water

🐟 Suitable For

• Small to medium freshwater aquariums
• Community fish tanks
• Guppy, molly, betta, and small cichlid setups
• Beginner aquariums
• Lightly stocked planted tanks

🌟 Key Features

• ✔ Space-saving hang-on design
• ✔ Stronger flow compared to BLH-301
• ✔ Multi-stage filtration system
• ✔ Quiet and energy-efficient operation
• ✔ Easy installation and maintenance
• ✔ Improves water clarity and oxygenation