How to Choose the Right Filtration System for Your Water Feature

Ben Goulart
Jan 3
3 min read

Updated: Apr 25

Multiple fountains spill into a gorgeous koi pond surrounded by lush tropical plants

The right filtration system is essential to keeping your water feature clean, healthy, and beautiful. Whether you have a pondless waterfall, a koi pond, or a dipping pond, the right filter ensures proper water circulation, reduces maintenance, and supports a balanced ecosystem. In this guide, we’ll walk you through the key considerations for selecting the perfect filtration system for your specific water feature.

Pump kits for our custom water features utilize the best technology available. — We source our materials from the best and this is especially important when it comes to pumps.

1. Understanding the Role of Filtration

Filtration systems are the heart of any water feature. They serve three key purposes:

Mechanical Filtration: Removes debris like leaves, twigs, and sediment from the water.
Biological Filtration: Supports beneficial bacteria that break down harmful toxins, creating a balanced ecosystem.
Chemical Filtration: (Optional) Helps remove impurities and maintain water clarity.

Each type of water feature has unique filtration needs, so understanding the role of filters is the first step in making the right choice. Picking the right filtration system for water features is an important first step before you get started.

2. Filtration for Pondless Waterfalls

Pondless waterfalls rely on a recirculating system where water flows over rocks and is collected in a hidden reservoir. The filtration system must:

Handle debris efficiently since leaves and dirt can clog pumps.
Be compact and low-maintenance to match the hidden design of the feature.

Recommended Solution: A skimmer or pre-filter attached to the pump works best to capture debris before it reaches the reservoir. Pair it with a pump vault for easy access during maintenance.

3. Filtration for Koi Ponds

Koi ponds are delicate ecosystems that require specialized filtration to keep water clear and fish healthy. Key needs include:

A strong biological filter to manage fish waste and maintain water quality.
Mechanical filtration to prevent debris buildup.
Aeration to ensure adequate oxygen levels for koi.

Recommended Solution A combination of a bead filter for mechanical filtration and a biofilter to cultivate beneficial bacteria works best. UV clarifiers can also be added to combat algae and maintain crystal-clear water.

4. Filtration for Dipping Ponds

Dipping ponds, often used for wading or small recreational areas, require clean and safe water. Their filtration needs include:

A system that prevents bacterial growth and removes debris.
Easy maintenance for frequent water use.

Recommended Solution: Pressure filters are ideal for dipping ponds as they combine mechanical and biological filtration in one system. Pairing this with a UV clarifier ensures the water stays clean and clear for human use.

5. Size Matters: Matching Filters to Your Water Feature

The size of your water feature directly affects your filtration needs. Consider:

Water Volume: Larger features need more robust systems.
Flow Rate: The pump and filter must work together to circulate the entire volume of water at least once per hour.
Feature Type: A pond with fish has higher filtration demands than a pondless system.

6. Maintenance Considerations

Some filtration systems require frequent cleaning, while others are designed to minimize maintenance. Choose a system that aligns with your availability and commitment to upkeep. For example:

Skimmers and pre-filters need regular debris removal.
Biological filters require occasional rinsing to keep bacteria colonies healthy.
UV clarifiers may need bulb replacements every season.