SunSun CBF-350 Bio Gravity Pond Filter — Up to 1500 Gallons

Experience easier, more efficient pond filtration with the SunSun CBF-350 Bio Gravity Pond Filter. This all-in-one box system is designed to handle water turnover for ponds with fish up to 1,500 gallons or ornamental ponds up to 3,000 gallons, delivering clarity through a thoughtful multi-stage setup.

The CBF-350 uses gravity to move water through a carefully layered filtration bay, beginning with media you choose, followed by high-quality Japanese matting, and finishing with two blue coarse foams and two yellow fine foams. An additional space at the end of the bay invites extra media, letting you tailor the filtration as your pond evolves. The result is a compact unit that processes substantial water while staying straightforward to operate.

Four-stage filtration for versatile cleaning

Stage one starts in the media bay, where you can customize filtration with your preferred media. Stage two passes water through Japanese matting to capture fine debris. Stage three uses coarse and then fine foams to trap particles of varying sizes, while the final section offers extra media room for ongoing customization.

• Coarse foams: 2 blue elements included for larger debris
• Fine foams: 2 yellow elements included for finer particles

Key specs to plan around:

• Filter dimensions: 21" x 17" x 15"
• Maximum pump flow: 2100 GPH
• Suitable for fish ponds up to 1,500 gallons or ornamental ponds up to 3,000 gallons
• Dirt drain at the bottom helps remove settled debris during maintenance

Why homeowners choose the SunSun CBF-350

This filtration solution combines four stages in a single, compact unit, reducing guesswork and streamlining maintenance. Included media foams support a clear look, while the dirt drain simplifies routine cleaning. The extra media space in the bay invites customization as your pond needs shift over time.

Real-life use scenarios

For koi ponds, the system handles larger debris with the coarse foam while refining fine particles with the fine foam. For ornamental ponds, the ability to swap or add media supports seasonal changes and algae management. The gravity-based design minimizes complex plumbing, making setup approachable for both beginners and experienced pond keepers.

In short, the SunSun CBF-350 aims to deliver reliable water turnover, a beginner-friendly installation, and a flexible filtration backbone that you can adapt as your pond grows or changes, without promising guaranteed results.