Oase BioPress 4000 Pressurised Pond Filter

Oase BioPress 4000 Pressurised Pond Filter

Compact Pressurised Filter with Integrated UV for Small Ponds

The Oase BioPress 4000 Pressurised Pond Filter is a compact and efficient filtration system designed for small garden ponds, decorative water features and lightly stocked fish ponds. Combining mechanical filtration, biological media and a built in 7W ultraviolet clarifier, it provides clear and healthy pond water in a simple, easy to maintain unit.

Thanks to its sealed pressurised housing, the BioPress 4000 allows filtered water to be pumped to a higher level than the filter itself. This makes it ideal for feeding a small waterfall, stream or cascade while keeping the filter discreetly positioned at the side of the pond or partially buried in soft ground.

Easy Clean Technology and Simple Maintenance

Maintenance is straightforward and hygienic. The integrated easy clean handle compresses the internal filter sponges, helping to remove accumulated waste without the need to touch the foam media directly. This simplifies servicing and reduces downtime.

A built in 7 watt UV clarifier helps control single celled algae, preventing green water and improving clarity. The inspection window allows you to check that the UV lamp is operating correctly at a glance. In addition, the quick release lid makes opening the filter fast and simple during routine cleaning.

The Oase BioPress 4000 is suitable for:

• Ornamental ponds up to 4000 litres
• Fish ponds up to 2000 litres
• Koi ponds up to 1000 litres

It offers a cost effective alternative to larger pressurised systems such as Oase FiltoClear models and provides a practical pondside solution for smaller setups.

Key Features

• Compact pressurised pond filter with integrated UV
• Suitable for ponds up to 4000 litres
• Built in 7W ultraviolet clarifier for green water control
• Easy clean handle for sponge compression and waste removal
• Sealed housing allows water to be pumped to a higher elevation
• Ideal for waterfalls and small streams
• Inspection window for UV function monitoring
• Quick release lid for easy maintenance
• Can be partially buried for discreet installation
• 2 year manufacturer guarantee

Technical Specifications

• Dimensions: 225 x 335mm (Diameter x Height)
• UVC power consumption: 7W
• Recommended hose sizes: 3/4 inch, 1 inch, 1.25 inch, 1.5 inch
• Pond size: Up to 4000 litres depending on fish stock
• Filter UVC cable length: 5m
• Pump cable length: 10m
• Filter guarantee: 2 years
• Pump guarantee: 2 years

Technical information

Choosing the right pump setup

When choosing a pond pump, the number on the box is only the starting point. Real flow is affected by head height, pipe length, bends, hose diameter, valves, UV units and the filter it is feeding. A pump that looks powerful on paper can lose a lot of performance if it is pushed through undersized hose or a restrictive run of fittings.

For best results, plan the pump, filter, UV and return pipework together. Use larger bore hose or pressure pipe where possible, keep bends sensible and leave enough access to remove the pump for cleaning. This gives the equipment a better chance of delivering the flow the pond actually needs.

UV sizing and maintenance notes

Oase BioPress 4000 Pressurised Pond Filter should be matched to the pond volume, flow rate and water clarity problem you are trying to solve. UV clarification works best when water passes the lamp at a suitable speed and the quartz sleeve is kept clean. If the flow is too fast, contact time can be reduced. If the lamp is old or the quartz sleeve is dirty, performance can drop even when the unit still appears to be switched on.

• Replace UV lamps as part of routine seasonal maintenance.
• Clean or inspect the quartz sleeve when water clarity starts to deteriorate.
• Match the UV to the pump and filter rather than installing it in isolation.
• Allow safe access for lamp changes and winter maintenance.

Good UV performance also depends on mechanical filtration. Removing fine debris before the UV helps the lamp work on green water algae more effectively.

Helpful links and compatible products

Use these links to plan the rest of the system around this product. The right pump, pipework, UV, air supply, media or spares will make the installation easier to set up, maintain and service.

• View the full Oase range
• Pond filters
• Pond pumps
• UV clarifiers
• Standard flexible pond hose
• Heavy duty flexible pond hose

More useful ranges and guides

These related ranges and guides may help you compare options, choose the right accessories and plan the full pond system rather than viewing this product in isolation.

• Browse pond and garden lighting
• Browse pond waterfalls and water features
• pressurised pond filter guide