The M25P pressurised throughput FB unit will cater for heavy stocked ponds up to 2,500 gallons (11,250 litres), - with an ideal final operational flow rate of around 200/250gph. nThis unit is approx 600mm high (24") with a 110mm (4") diameter core containing 3kg of silica sand, together with standard 38mm (1.5") pipe manifolds including 2 No ball valves. nThe bottom valve is used to control flow and balancing, with the top valve offering the close down facility to act as a byepass to the FB. nThe M25P will support up to 50kg (110lb) of fish load.

Introduction To Fluidised Bed Filters
Gravity Installation: For guidance purposes this configuration is based upon a gravity supply to the main filter, with the external filter pump feeding and discharging through the FB unit. Return to pond is via a single pipe. In setting up the ball valve (No2) correctly the main content of water returning to the pond from the main filter is designed to flow through the manifold pipework on the FB tower, without actually passing through the FB media itself. Only a small percentage (around 10%) of water passes direct through the FB media.

The dilemma of very high fish stocks overloading an existing filter system has frequently meant replacing the entire system or adding to it in a conventional manner, but often the case is that there is insufficient floor space (or finances) to execute either option. This is where the economical Fluidised Bed filter fully comes into its own, and providing that the existing system can adequately cater for mechanical filtration, then a vast improvement in water quality parameters will be evident.

The ability of Fluidised Bed filters to biological cater for extremely high level fish loads has been well documented, as have the wear and short life problems encountered by some companies producing such devices back in the year 2000. Only now in 2002 after considerable field and laboratory research can Cloverleaf offer the very best in FB’s – assisted greatly by the unique specification of silica sand used, and which is scientifically known to offer superior bacteria colonisation than that achieved by coral sand and other common types. Put into perspective, studies would indicate that the unique Cloverleaf biomass silica media has such impressive properties that 3kg will support the same volume of beneficial bacteria that might otherwise only be achievable if using 50 sacks of average filter rock or gravel.

Cloverleaf FB’s are manufactured in 3 varying sizes, and are available in two designs – (1) Pumped with gravity return (2) Pumped with pressurised return. Unlike some other manufacturers products the Cloverleaf range incorporates a non return valve to prevent the loss of sand via any siphoning actions.

As a guide to flow rates and application of use, approximately 10% of the ponds volume should be directed through the Fluidised Bed filter. By the nature of design and media used FB's should only be installed on existing mature ponds where adequate mechanical filtration also exists.