SunSun CBF-350 Biological Flow-Through Pond Box Filter (Up to 12,000 Liters)

Brand: SunSun

Model: SUN-CBF-350

Availability: In Stock

Short Description

Keep your pond water clear, healthy, and oxygenated with the SunSun CBF-350 Biological Pond Filter. Designed for garden ponds up to 12,000 liters (6,000 liters for ponds with fish/Koi), this gravity-fed flow-through filtration unit combines mechanical particle removal with multi-stage biological purification. Featuring integrated temperature readouts, dirt level indicators, and an easy-clean squeeze system, maintaining a healthy aquatic ecosystem has never been easier.

Key Features & Highlights

• Multi-Stage Filtration System: Combines mechanical coarse/fine filtration sponges and a Japanese matting layer (Japan mat) to trap debris and foster beneficial nitrifying bacteria.
• Integrated Temperature & Dirt Indicator: Easily monitor real-time water temperature and track filter clog levels at a glance without opening the lid.
• Easy-Clean Shoving/Squeeze System: Clean filter media quickly without messy teardowns—simply press and squeeze out trapped sludge using the integrated mechanism.
• Bottom Sludge Waste Drain: Built-in bottom outlet allows quick flushing of heavy dirt and coarse debris directly out of the chamber.
• Modular UV Clarifier Compatibility: Seamlessly mounts to SunSun CUV series UV-C clarifiers (e.g., CUV-218, CUV-224, CUV-236) to eradicate floating green algae.
• High Flow-Through Rate: Supports water flow rates of up to 8,000 L/h.

Detailed Product Description

The SunSun CBF-350 Bio Pond Box Filter is an all-in-one gravity filter solution engineered for medium-to-large garden ponds, Koi ponds, and decorative water features.

How It Works: Dual Mechanical & Biological Purification

1. Mechanical Filtration: Pond water enters the 60-liter capacity box filter via a connected pond pump. It passes through coarse and fine foam sponges that trap suspended particles, fish waste, leaf fragments, and floating dirt.
2. Biological Filtration: Water flows across the high-surface-area Japan Matting, providing the perfect habitat for beneficial microorganisms. These bacteria break down toxic ammonia and nitrites into harmless nitrates, supporting healthy fish and plant life.

Technical Specifications

What’s Included in the Box?

• 1× SunSun CBF-350 Bio Box Filter Housing
• 2× Fine Filter Sponges (Yellow)
• 2× Coarse Filter Sponges (Blue)
• 1× High-Density Japan Matting Sheet
• 1× Stepped Inlet Hose Adaptor Set
• 1× Temperature Gauge & Turbidimeter/Dirt Indicator Assembly
• 1× Bottom Drain Valve Connector
• Instruction & Installation Manual

Installation & Maintenance Tips

1. Positioning: Place the CBF-350 above the pond water level on the pond bank, hidden in a shaded location away from direct sunlight. Gravity allows filtered water to flow back into the pond through the 70 mm outlet.
2. Pump Selection: Connect to a submersible pond pump with a flow rate up to 8,000 L/h (pump sold separately).
3. Biological Cycling: Allow 4–6 weeks for beneficial bacteria to fully colonize the bio-media before switching on any attached UV-C clarifiers. Adding bacterial starters can accelerate this process.
4. Routine Cleaning: When the dirty-water indicator rises, open the bottom sludge drain and press the filter media using the internal squeeze handle to discharge accumulated dirt.

Frequently Asked Questions (FAQ)

Q: Is a pump included with the SunSun CBF-350?

A: No, the CBF-350 is a gravity-fed filter housing and media unit. A suitable submersible pond pump (up to 8,000 L/h) and connecting hose are required.

Q: Can I attach a UV-C clarifier directly to this filter?

A: Yes! The housing includes pre-drilled connection points designed to mount SunSun CUV series UV clarifiers (such as CUV-218, CUV-224, or CUV-236) directly onto the box.

Q: Can this filter be buried below ground level?

A: No. Because it is a gravity-exit flow-through filter, the outlet must remain above the pond water level. For underground installations, a pressurized filter is recommended.