Apparatus and method for filtering aqueous liquid

An aqueous liquid filtering apparatus comprising:

• an inlet configured to stream an aqueous liquid;
• an outlet configured to stream the aqueous liquid;
• a filtration chamber comprising an inlet opening;
• wherein the inlet opening is located near a bottom of the filtration chamber, in fluid communication with the inlet, and
• wherein an outlet opening is located near a top of the filtration chamber, in fluid communication with the outlet;
• a first dosing unit located upstream of the filtration chamber configured to release water-soluble components into a stream of aqueous liquid that flows from the inlet to the filtration chamber;
• a screen covering the outlet opening of the filtration chamber;
• a particulate filter media configured to partially fill an interior of the filtration chamber, the particulate filter media being comprises inorganic material, having a mass weighted average particle size between 100 and 900 microns, and having a specific gravity of 2 to 3 g/ml;
• a flow regulator configured to regulate a flow rate of aqueous liquid through the filtration chamber,
• wherein the flow regulator can operate in either a high flow rate mode or a reduced flow rate mode;
• and
• a timer configured to control the flow regulator;
• wherein the timer is programmed to alternatingly switch the flow regulator from the high flow rate mode to the reduced flow rate mode after a time period reaches a first predetermined time period, t1, that is in the range of 30 to 3000 seconds, and
• wherein the timer is programmed to alternatingly switch the flow regulator from the reduced flow rate mode to the high flow rate mode after a time period reaches a second predetermined time period, t2, that is in the range of 1 to 10 seconds.