Filter media for use in pool filters
AssigneeJohns Manville
InventorRay Gaudin
Life of this patent
Estimating the term…
Abstract
A sand filter for use with swimming pools includes a tank that has a hollow interior space and a top diffuser for allowing spent pool water to enter the tank and for distributing the pool water inside the tank. The sand filter also includes filter media formed as a bed of material on a bottom of the tank and also includes laterals that are located under the filter media and allow filtered pool water to exit the tank and flow back to the pool. The filter media includes a bed of sand that is disposed on the bottom of the tank and a layer of perlite material that is disposed on a top surface of the bed of sand. The perlite material is a high flow rate, low density perlite material that only contains a trace amount of floaters.
Claims9
A method of forming a perlite layered filter media in a filter component of a filter system that includes an inlet for introducing a liquid to be filtered into the filter system comprising the steps of:
- adding a first filter media to a bottom of a tank of the filter component to form a bed of the first filter media on a top surface of the bottom of the tank;
- operating the filter component so that liquid is drawn into the filter component and passes through the bed of the first filter media;
- and
- adding a predetermined amount of perlite material through the inlet that is in communication with and receives the liquid to be filtered, while the filter component is operating, resulting in the perlite material being added as a layer to a top surface of the bed of the first filter media.
Dependencies are inferred from the claim text.