It is advised that all pressurised filters be pre-filtered using a Cetus to reduce excessive backwashing and maintenance due to heavy solids. The Cetus Sieve has a variable inlet height using the unique patented Pondflow regulation system – for use when gravity fed.

Sieve filter; a widely used pre-filter In a sieve filter the water from the pond is led over a curved sieve. The sieve consists of hundreds of triangular sticks with a spacing of 0.2 or 0.3 mm (also called 200 or 300 microns).

Positioned above the water level of the pond, the sieve allows the filtered water to flow downward by gravity into your primary filter. This revolutionary pre-filter is specifically designed for seamless integration with any biological filter, including all types of pressure filters.

Removes fish waste, algae, needles, fish eggs and other debris. The HydroSieve™ compact pond sieve is gaviity fed pre-filter that connects to the bottom drain in a dedicated koi pond. By gravity fed, we mean that it is not pressurized, and is installed at the same level as the pond.

Pre-filters remove coarse dirt particles from water before it reaches the main filter, helping the filter do its job better and for longer. The Aqua Forte® UltraSieve III sieve filter takes water from a skimmer and/or bottom drain and runs it through a 300 micron (0.3mm) sieve, removing minuscule particles and allowing water to flow through.

The Cetus Sieve is a bow screened pre-filter made using the latest rotational molding technology. It is made for pre-filtration of any biological filter, including all pressure filters. Designed to efficiently and effectively remove large amounts of mechanical waste from a pond, and it includes the necessary parts to set it up to be gravity-fed ...

The Cetus Sieve is a self-adjusting sieve which can be installed either gravity fed or pump fed. The Cetus Sieve enables your pond water to be filtered of large amounts...

The most efficient pre-filter for (swimming) ponds; Reliable! (only one moving part) Stainless steel filter element; Waste is directly separated from the water circulation; No sound; No water loss; Waste can be 100% recycled; Very easy to maintain; Ideal for swimming ponds

It's designed to remove large amounts of pond waste and debris mechanically in a gravity-fed or pump-fed setup prior to entering your pond's main filter system. Recommended specifically for the Evolution Aqua Nexus, Eazy Pod, and K+ Pressure Filters, but the Cetus Sieve is compatible with all biological and pressurized filter systems.