He walked across to the filter beds and the great water tank.

Having removed as much algae as possible, use an aquarium hoover on the filter bed.

The filter beds were built in 1852, to provide cleaner water to London, as a response to an outbreak of cholera three years before.

The filter bed is still in place and can be seen from the road.

Additional modifications to the filter beds provided only temporary relief.

The filter beds then retain the slag granules, while the water filters away and is returned to the system.

The site includes old Victorian buildings, filter beds and some larger water storage beds.

The powerheads should draw the whole volume of the tank through the filter bed at least three times each hour.

To improve the water quality of the local streams, filter beds were constructed adjacent to the reservoir.

The Grand Canal passes through the business park, with filter beds for the drawing off of water.