In general, techniques are described for filter media monitoring within a filtration system. The filter media monitoring techniques described herein include, for example, direct contact with the filter media, e.g., a sensor may be located inside a boundary defined by a surface of the filter media, or indirect contact with the filter media, e.g., a sensor may be located outside the boundary defined by the surface of the filter media such that the sensor does not make direct physical contact with the filter media being monitored.

In general, techniques are described for filter media monitoring within a filtration system. The filter media monitoring techniques described herein include, for example, direct contact with the filter media, e.g., a sensor may be located inside a boundary defined by a surface of the filter media, or indirect contact with the filter media, e.g., a sensor may be located outside the boundary defined by the surface of the filter media such that the sensor does not make direct physical contact with the filter media being monitored.

A method and system for treating oilfield produced water is disclosed. The method includes passing oilfield produced water through a chain of filters, first filter configured to filter particles of a size larger than 10 m from the water, a second filter configured to filter remaining particles of a size larger than 2 m from the water and a third filter configured to filter remaining particles of a size larger than 0.5 m from the water and automatically cleaning at least one of the filters.

A water filter with alarm function for indicating blockage of a filter cartridge thereof and an alarm method are provided. The filter main body is provided with a filter cartridge and is arranged with a before-filtering water cavity. A filter upper cover covers the top of the filter main body. The before-filtering water cavity is accommodated with a floating-ball-type indicating apparatus, which comprises a floating ball, a connecting rod and a color scale. The connecting rod is mounted rotatably on an inner surface of the filter upper cover with the aid of a hinge support. The floating ball is arranged at the front end of the connecting rod. The color scale is also arranged on the connecting rod. A transparent visual cover that matches with the color scale is arranged on the upper surface of the filter upper cover.

A filter medium contamination detection structure may comprise a filter element and a prompt assembly. The prompt assembly may comprise a first pressure sensor, which may comprise a signal output end, and a second pressure sensor, which may comprise a signal output end. The first pressure sensor may be connected to a water inlet of the filter element, and the second pressure sensor may be connected to a water outlet of the filter element or outside air. The signal output ends of the first pressure sensor and the second pressure sensor may be connected to a signal input end of a controller. When the filter element is dirty, a pressure at the water inlet end may increase or a pressure at the water outlet end may decrease, and the difference between the first sensor and the second pressure sensor may increase.

A fluid filtration system may include a fluid filter assembly that includes a filter element configured to filter a fluid and a sensor probe incorporated into the fluid filter assembly. The sensor probe may include a chemically reactive material sensitive to at least one property of the fluid and at least a portion of the sensor probe may be exposed to the fluid.

A fluid filtration system may include a fluid filter assembly that includes a filter element configured to filter a fluid and a sensor probe incorporated into the fluid filter assembly. The sensor probe may include a chemically reactive material sensitive to at least one property of the fluid and at least a portion of the sensor probe may be exposed to the fluid.

A method for detecting filter status is applicable to an electronic device including a filter, and the method includes the following steps. In response to activation of the electronic device, timing is started and an accumulated operating time is obtained. In response to the accumulated operating time being greater than or equal to a time threshold value, a level of dirtiness of the filter is detected through an optical sensing element. The time threshold value is adjusted according to the level of dirtiness of the filter. A notification related to the filter is provided according to the level of dirtiness of the filter.