A water treatment insert for a pool skimmer system includes a chemical treatment portion separated from a mechanical filtration portion. The treatment device includes an upper portion and a lower portion. The upper section can include a vertical wall or walls, which should be substantially watertight so that substantially all the water entering the pool skimmer flows through the upper portion, and then into the lower section. The entire device is preferably received in the filter basket receiving section of a conventional pool skimmer, in place of the conventional filter basket. One of the upper and lower sections provides mechanical filtration and the other chemical treatment, to enhance the water treatment function of the skimmer.

The present invention provides a sewage treatment biological agent and a preparation method and application thereof. The sewage treatment biological agent according to an embodiment of the present invention includes an induced nucleus. The induced nucleus has good bioaffinity. A microbial flora can be attached to the induced nucleus to achieve rapid growth. As the microbial flora gathers and grows on the induced nucleus, the granulation is gradually achieved by the sewage treatment biological agent to facilitate the sewage treatment. The microbial flora grows on the induced nucleus, and the growth process of microbial flora is a covering growth process which starts from the induced nucleus and gradually expands outward and centers on the induced nucleus. During the growth of microbial flora, extracellular polymers are secreted, which can further promote the granulation process by the sewage treatment biological agent.

A floating and energy-autonomous device (1) configured to dispense a solid compound (2) into a volume (3v) of liquid. The device (1) includes a reservoir (9) of solid compound (2), and a pump (13) configured to generate a circulating flow of the liquid (3) coming from the volume (3v) of liquid and passing through the reservoir (9) before returning to the volume (3v) of liquid. The device (1) includes a sensor (17) configured to generate a sensor signal indicative of a parameter of the volume (3v) of liquid or of a gaseous environment (4) of the device (1), and/or an antenna (18) configured to receive a radio signal, and to generate an antenna signal. The device (1) includes a microcontroller (19) configured to command the pump (13) and to regulate the circulating flow rate of the liquid (3) on the basis of the sensor signal and/or of the antenna signal.

A swimming pool filter element capable of automatically dosing. The swimming pool filter element includes a folding filter element and a doser filter element. The folding filter element includes a filter membrane and end covers, the end covers each having an upper end cover and a lower end cover. A wrench cover is arranged at the upper end of the upper end cover. The doser filter element includes a doser end cover, a doser lining and a doser shell. The doser filter element is added into the folding filter element, so that a water flow needing to be filtered firstly passes through the filter membrane of the folding filter element, solid large-particle impurities are filtered out, then the water flow enters the doser filter element and makes contact with sterilization tablets placed in the doser filter element, the tablets are dissolved, and finally water with dissolved tablets is discharged into a swimming pool.

The filter includes a body, cap, and a filter media. The body includes an internal chamber and a plurality of perforations exposing the internal chamber. A filter media is positioned and retained in the internal chamber such that it covers the plurality of perforations. The internal chamber is in fluid communication with a water fill hose so as to receive water and dispense the water out of the body through the plurality of perforations after having passed through the filter media. The cap is adapted to cover the open top of the body. The cap includes a threaded passage for receiving a male threaded connector on the hose. The internal chamber is preferably filled with sanitizer preferably selected from a group consisting of an oxidizer and chlorine.

The present invention provides calcium hypochlorite compositions that dissolve in approximately one week, while displaying both favorable reactivity properties and dissolution characteristics for recreation water treatment. The present invention benefits from the discovery that the dissolution profile of calcium hypochlorite compositions can be altered by providing compositions within a critical density range, for example when provided in the form of a tablet.

The invention generally relates to methods and systems for adding chemicals to a body of water through a skimmer basket in a strainer well associated with the body of water.

The present disclosure relates, in part, to enhanced weathering systems and/or apparatuses and methods of use thereof. In one aspect, the present disclosure provides a method of at least partially sequestering CO.sub.2 from an influent aqueous solution comprising aqueous and/or gaseous CO.sub.2. In another aspect, the present disclosure provides a method of at least partially sequestering CO.sub.2 from a gaseous CO.sub.2 source. In another aspect, the present disclosure provides systems and/or apparatuses suitable for use in the methods described herein. In another aspect, the present disclosure provides a method of optimizing the design and operation of a system for at least partial sequestration of CO.sub.2 from a water source.

An inline filterwell system with a floating weir that delivers a dispersant into the water in an inline filterwell where a cartridge dispenser dispersant rate of a cartridge dispenser located in a cartridge jacket of the weir is isolated from changes in the velocity of water flowing through an open body of the weir.

A system for remediation of perfluoroalkyl substances (PFASs) has a multiplicity of β-cyclodextrins (β-CDs) and/or modified β-CDs combined with a vehicle additive, and a delivery device. Modified β-CDs can contain a single amine functionality at a single primary carbon or single secondary carbon of the β-CD. The vehicle additive can be powdered activated carbon (PAC). The delivery device is a column, a pouch, a packet, or a sheet that can permit the contacting of a fluid environment with the β-CDs and vehicle additive. The system of remediation can be used for a fluid environment or for biological organisms. CD-based fluorescent sensors can detect PFASs in the environment.