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Western Carbons has installed over 30,000 tonnes of all types of filter media. The general procedure for the placement of filter media is described below. This forms the bases of the site specific method statement.
Pattern Test
This is carried out by the client prior to the installation of the filter media to check the condition of the filter floor, The water used in the test [150mm] may be left in the filter ready for the installation of the first layer of gravel.
Water Supply
All the filter media is pumped into the filter via a 75 mm flexible hose. The water requirement is 60m3/hour. This may be provided from several sources
1. From a standard water hydrant
2. From a chamber full of water from which submersible pump may  supply the water to the media pump.
3. From the filter being filled with media. The submersible pump is hung in the filter enabling the water to be recycled.
Gravel Installation
The gravel is delivered to site in tote bags, and brought to the media pump using a forklift truck. The gravel is placed into the hopper and pumped to the filter where is is spread evenly over the floor by an operator.
The water left in the filter helps protect the nozzles and filter floor whilst the first media is installed.
The layer of gravel is then leveled by hand working back to the exit ladder to ensure no footprints are left in the media.
A further pattern test may now be done by the client to check that all the nozzles are in situ and that none have been broken.
Subsequent layers of gravel are installed in a similar manner except that the gravel is placed working from the access point on to the layer of gravel being installed. This ensures that the lower layer will not be disturbed.
Sand Installation
The sand may be delivered to site either in tote bags or by bulk tipper. By accepting delivery in bulk the environmental and financial costs of the tote bags is eliminated.
The sand from the bulk tipper is tipped into the media pump via its grain hatch and pumped directly to the filter.
The sand is backwashed by the client to both level and clean the layer
The sand layer is the completely drained down so that the level may be checked and the fines removed from the surface. This process of removing up to 12mm from the top of the sand layer is done by hand with the waste being placed into tote bags ready for subsequent disposal.
Anthracite Installation
The anthracite filter media is delivered to site in tote bags
The anthracite is pumped into the filter to the required level.
The anthracite is backwashed by the client to both level and clean the layer.