Disclosed are methods of monitoring the presence of naphthenic acids and related compounds. In particular, the invention provides a method of continuously monitoring naphthenic acids and related compounds that break through a filtration step in a wastewater treatment process.

A filter unit includes a body portion with first and second engagement surfaces that traverse at least a part of the body portion. The first and second engagement surfaces include a first segment that extends substantially parallel with a longitudinal extent of the body portion and a second segment that extends at an angle relative to the first segment. An engagement protrusion extends from the body portion and has a water inlet and a concave engagement wall with a water outlet. A periphery of the concave engagement wall includes a first portion with a first radius of curvature and a second portion with a second radius of curvature that is larger than the first radius of curvature. A first seal is disposed on a sidewall of the engagement protrusion proximate the water outlet. A first cross-section of the engagement protrusion, taken at the first seal and perpendicular to the longitudinal extent of the body portion, is egg-shaped with only one axis of symmetry. A second seal is disposed on the engagement protrusion and spaced apart from the first seal. A second cross-section of the engagement protrusion, taken at the second seal and perpendicular to the longitudinal extent of the body portion, is egg-shaped.

A method for fluid treatment that provides variable or alternative regeneration cycles within the same fluid treatment device. The duration of all stages of the regeneration cycle can be adjusted depending upon the amount of fluid treated so that regenerant resources such as water are not underutilized and waste is not discharged unnecessarily into the environment. Additionally or alternatively, a regeneration sequence may include a fluid release sequence in which a fluid is released from a water treatment tank by successive linear movement of a piston in a valve assembly.

A hand-holdable portable water purifying and dispensing unit is described comprising at least a housing, a purified water inlet, a further-purified water dispense outlet, a dispense operator, a reservoir, one or more water further-purification devices, and an internal water recirculation pump and pathway, said pathway including the reservoir and the one or more water further-purification devices. Optionally, the reservoir has a volume in the range 100 ml to 2000 ml, preferably in the range 200 ml and 1000 ml.

Systems and methods for controlling chlorinators for pools and spas are provided. A controller communicates with a processor positioned within a replaceable cell cartridge of a chlorinator, to allow for remote control and diagnosis of the chlorinator and/or cell cartridge. The cell cartridge stores, in non-volatile memory on board the cartridge, one or more parameters associated with the cartridge. The controller can obtain this information from the processor of the cell cartridge, and can use same to configure operation of the chlorinator. Information relating to remaining cell life can be updated by the controller and stored in the non-volatile memory of the cell cartridge. Electrical and software-based mechanisms are provided for ensuring operation of only compatible cell cartridges with the chlorinator. A system for remotely diagnosing errors associated with the chlorinator is also provided.

A container assembly is disclosed. The container assembly includes a container that contains a volume. Selected portions of the container assembly may be removable. A spigot assembly may be removed and associated with a filter assembly. An ambient light sensor may be included to determine when the filter assembly has been removed.

A container assembly is disclosed. The container assembly includes a container that contains a volume. Selected portions of the container assembly may provide indication to a user of features or status of the container assembly.

An embodiment provides a method for determining a filter life, including: introducing an aqueous sample into a filtration device comprising at least one filter and one or more sensors located upstream of the at least one filter, wherein the one or more sensors are capable of measuring a component of the aqueous sample; measuring the component of the aqueous sample using the one or more sensors; identifying a load on the at least one filter based upon the measuring of the component of the aqueous sample and at least one filtration characteristic; and determining the filter life of the at least one filter based upon the identifying. Other aspects are described and claimed.

A method including determining a first value associated with a first component of a water filtration system using a first sensor of the water filtration system, determining whether the first component is degraded based on the first value, and in response to determining that the first component is degraded, initiating a shipment of a replacement component.

A water treatment apparatus management system which manages a household water treatment apparatus located at or near a place of water use, and treats water before treatment with at least one type of filter to produce treated water for the place of water use. The system includes: a filter information storage unit storing information regarding an in-service filter used in the household water treatment apparatus; an information receiver receiving information regarding performance change of the in-service filter from the household water treatment apparatus; and a water type estimation means that estimates a water type of the water before treatment based on the information regarding performance change and the information regarding the in-service filter. The information regarding the in-service filter includes reference information of performance change of the same or the same type of filter as the in-service filter for each of plural types of reference water before treatment.