The CL Professional Range

Few manufacturers in the world have put as much effort into designing a flexible and good value range of multi-bay filters suitable for the Koi pond. Key features of this well constructed compact "CL" range are the options of the filters being pump or gravity feed (meaning below ground), whilst meanwhile being very simple to maintain. The incorporation of vortex bays, and skillful use of mechanical and biological bays using quality mediums encompassing good water flows are further attributes that make the range a superb and sound investment. For very large ponds all filters can be happily installed as pairs - linked to separate pumps or bottom drains

This drawing illustrates the general design concept to both the Cloverleaf “CL” and “Genesis” range. As can be seen key beneficial features are numerous, starting from the principles of up and down flow through the tanks thereby keeping the water in contact with the mediums for as long as possible. Apart from the advantageous separation and settlement of solids in the vortex bay, the generation of an “upflow” and the incorporation of settlement areas (with drain down valves) ensures that the filtration mediums stay cleaner for longer – thus promoting larger colonies of beneficial bacteria, and by default thereby establishing a healthier pond environment. The clever design layout of the vertical transfer ports also provides the highly useful bonus of being able to incorporate air stones (where desired) without the need for the pond to appear similar to a witch’s cauldron.

The site installation of the CL4 model is unique to the range, in that pressures on the casing welds brought about by the weight of water (approx. 1 ton per bay without media) requires that the unit needs to be placed on a firm level concrete base, and partially encased in concrete to provide lasting stability and a long life. This applies regardless of whether the unit is pump or gravity fed, and the diagram illustrates the basics of what needs to be achieved.

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