SunSun CBD-380 Bottom Drain with Aeration Disk

The SunSun CBD-380 Bottom Drain is designed for professional koi ponds and garden ponds, ensuring optimal water circulation, filtration efficiency, and oxygenation. With its 380mm drain body and integrated 260mm aeration disk, it provides both debris removal and oxygen enrichment for a healthier pond environment.

Key Features of SunSun CBD-380 Bottom Drain

✅ Efficient Water Collection – Mounted at the pond bottom to collect water from the lower layers for filtration and circulation.
✅ Enhanced Filtration Performance – Reduces stagnant areas, silt buildup, and harmful bacteria growth.
✅ Aeration Disk Included – Integrated 260mm EPDM aeration disk improves oxygen levels and water mixing.
✅ Durable Construction – Made from high-strength ABS polymer with long-lasting EPDM membrane.
✅ Balanced Circulation – Recommended flow distribution: 70–75% via bottom drain, 25–30% via skimmers.
✅ Easy Installation – Equipped with a 4" (110mm) connection and check valve for reliable operation.

How the SunSun CBD-380 Works

The bottom drain actively pulls water from the lowest pond layers, carrying debris, silt, and waste to the filter system. This not only improves water clarity but also boosts filter efficiency.

The integrated aeration disk (connected to an air compressor, sold separately) delivers 60–100 L/min airflow, saturating the lower pond layers with oxygen while promoting even water circulation.

This dual function ensures a cleaner, healthier pond with more active fish.

Technical Specifications

Bottom Drain (CBD-380):

• Diameter: 380 mm
• Connection: 4" (110 mm)
• Weight: 2.2 kg

Aeration Disk:

• Diameter: 260 mm
• Capacity: 60–100 L/min
• Air Line Connection: 8–10 mm hose
• Equipped with: Check valve
• Materials: ABS polymer body & EPDM membrane

Installation Guidelines

• Maintain 2–2.5 cm gap between the drain cover and pond bottom.
• Water outlet line should be installed at a 45° angle for optimal flow.
• Connect the aeration disk to a suitable air compressor (sold separately).
• Place centrally in the pond bottom for maximum debris removal and circulation.

Why Choose the SunSun CBD-380?

• Combines drainage + aeration in one unit.
• Improves water quality, oxygen levels, and circulation.
• Extends the lifespan and efficiency of your pond filter system.
• Perfect for koi ponds, ornamental garden ponds, and aquaculture setups.

FAQs – SunSun CBD-380 Bottom Drain

Q1: Do I need an air pump for the aeration disk?
👉 Yes, an external air compressor (60–100 L/min) is required.

Q2: Can this be used without aeration?
👉 Yes, the bottom drain works independently, but aeration adds significant benefits.

Q3: What size pond is it suitable for?
👉 Ideal for medium to large koi ponds, where strong circulation and oxygenation are required.

Q4: How much water should circulate through the bottom drain?
👉 Recommended: 70–75% through the drain, 25–30% via skimmers.

Q5: Is the aeration safe for koi and fish?
👉 Absolutely. Aeration improves oxygen levels, reduces harmful bacteria, and supports fish health.