A device and system for purifying a fluid is provided. The system includes a tank having an interior space and a media container disposed within the interior space. A valve is provided that cooperates with an element within the interior, the valve being movable between an open and a closed position. The valve being biased to the open position when the element is not positioned within the interior space, wherein the interior space is fluidly coupled to the atmosphere in the open position. The valve further being configured to move to a closed position when the element is positioned within the interior space.

A device and system for purifying a fluid is provided. The system includes a tank having an interior space and a media container disposed within the interior space. A valve is provided that cooperates with an element within the interior, the valve being movable between an open and a closed position. The valve being biased to the open position when the element is not positioned within the interior space, wherein the interior space is fluidly coupled to the atmosphere in the open position. The valve further being configured to move to a closed position when the element is positioned within the interior space.

The subject matter of this specification can be embodied in, among other things, a filter replacement kit that includes a filter cartridge. The filter cartridge includes a filter body, a filter media disposed within the filter body, a neck portion having a fluid inlet and a fluid outlet, and a cartridge engagement mechanism on the neck portion for engaging a manifold assembly. The cartridge engagement mechanism includes at least one filter engagement surface. The filter replacement kit also includes compatibility indicia indicating that the filter cartridge is compatible with at least one appliance. The at least one appliance includes the manifold assembly including a manifold engagement mechanism having a manifold engagement surface with first and second horizontal portions, and an angled portion disposed between and joining the first horizontal portion to the second horizontal portion, wherein the filter engagement surface is non-congruent to the manifold engagement surface.

A filter assembly includes a filter head and filter cartridge. The filter cartridge includes a housing and element. The housing includes a can with an open mouth. An interface ring is secured to the can adjacent to the open mouth. The outer ring surface is against the inner wall of the can. The ring wall is angled between the first and second ends greater than one degree and less than 6 degrees. Methods of filtering and making the housing are provided.

A filter assembly includes a filter head and filter cartridge. The filter cartridge includes a housing and element. The housing includes a can with an open mouth. An interface ring is secured to the can adjacent to the open mouth. The outer ring surface is against the inner wall of the can. The ring wall is angled between the first and second ends greater than one degree and less than 6 degrees. Methods of filtering and making the housing are provided.

A device and system for purifying a fluid is provided. The system includes a tank having an interior space and a media container disposed within the interior space. A valve is provided that cooperates with an element within the interior, the valve being movable between an open and a closed position. The valve being biased to the open position when the element is not positioned within the interior space, wherein the interior space is fluidly coupled to the atmosphere in the open position. The valve further being configured to move to a closed position when the element is positioned within the interior space.

A device and system for purifying a fluid is provided. The system includes a tank having an interior space and a media container disposed within the interior space. A valve is provided that cooperates with an element within the interior, the valve being movable between an open and a closed position. The valve being biased to the open position when the element is not positioned within the interior space, wherein the interior space is fluidly coupled to the atmosphere in the open position. The valve further being configured to move to a closed position when the element is positioned within the interior space.

A filtration system interconnection structure having a filter manifold including a sump and a coded polymagnet located on or connected to a portion of the manifold, and a filter cartridge including a filter media, first and second end caps sealed to the filter media, and a paired coded polymagnet magnet located on or connected to the filter cartridge. The polarity profiles of the paired coded polymagnets are aligned such that a magnetic attraction force, magnetic repulsion force, or combination thereof, is generated therebetween when the filter cartridge is inserted within the manifold sump housing and moved to the alignment position, thereby causing the coded polymagnet located on or connected to the manifold to translate with respect to a longitudinal axis of the sump to allowing for direct or indirect actuation of downstream system functionality.

A filtration system interconnection structure having a filter manifold including a sump and a coded polymagnet located on or connected to a portion of the manifold, and a filter cartridge including a filter media, first and second end caps sealed to the filter media, and a paired coded polymagnet magnet located on or connected to the filter cartridge. The polarity profiles of the paired coded polymagnets are aligned such that a magnetic attraction force, magnetic repulsion force, or combination thereof, is generated therebetween when the filter cartridge is inserted within the manifold sump housing and moved to the alignment position, thereby causing the coded polymagnet located on or connected to the manifold to translate with respect to a longitudinal axis of the sump to allowing for direct or indirect actuation of downstream system functionality.

Described are apparatus, systems, and methods of improving cleaning of, e.g., stairs of swimming pools. Automatic swimming pool cleaners (APCs) capable of autonomous movement within water-containing vessels may be utilized to provide enhanced cleaning of sections of the vessels containing stairs or other angled surfaces.