filter bed

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

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

Additional modifications to the filter beds provided only temporary relief.

Some have public health significance being associated with sewage filter beds and septic tanks.

If it remains high the undergravel filter bed may not be large enough to cope.

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

A surface wash step in a backwash cycle usually takes place at the beginning of the filter bed cleaning process.

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

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

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

Previous management includes a limestone filter bed, installed in the 1960s, which is now redundant.

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.

For the best distribution of water throughout the filter bed, a finely slitted filter plate is usually more effective.

You can demonstrate that with a simple filter bed and some coarse "debris" of metal filings or other large particle size "dirt".

A nature reserve occupies the former Middlesex Filter beds on the island between the two watercourses.

The site was levelled, apart from the engine house buildings and the settling tanks and filter beds.

He also devised a system of waterworks, comprising three large pumping stations, with their filter beds and settling tanks.

First, the filter is taken off line and the water is drained to a level that is above the surface of the filter bed.

Do not use coral sand as a filter bed substrate as this will gradually dissolve and affect the calcium level.

The filter beds were altered and enlarged four times between 1876 and 1883 with only minimally noticeable effect, while demand was constantly increasing.

It also allows the mash of converted grain to create a filter bed during lautering (see brewing).

Rainwater filtering, using filter beds made up of alternating layers of sand and activated charcoal.

Oil, grease, fat, and soap arising from pollution may be troublesome through the coating of channels, pipes, and filter beds.