A mobile device reads a test strip to determine a chemical condition of a liquid or a user inputs a treatment plan into the mobile device. The mobile device transmits the determined chemical condition or the input treatment plan to a liquid treatment system which treats the fluid in response to the determined chemical condition or the input treatment plan.

A method of treating water in a water treatment system after a replacement of an ion exchange bed includes introducing water to be treated into the ion exchange bed of the water treatment system to produce treated water, calculating a current exchange daily average flow rate of water through the water treatment system, calculating a cumulative daily average flow rate of water through the water treatment system, and determining an estimated number of days remaining to exhaustion of the ion exchange bed based on the current exchange daily average flow rate and the cumulative daily average flow rate.

A chlorine generator apparatus wherein a housing is adapted to be mounted in an exterior, user-accessible surface of a spa and a chlorine generating electrode cartridge carrying a pair of electrodes is configured to be installable by a user in the housing and to thereafter be removeable by the user for replacement.

An apparatus for determining total hardness in a fluid stream utilizing an ion exchange column in a monovalent cationic form having an inlet and an outlet, where one or more monovalent ion selective electrodes are positioned either at an inlet, outlet, or at both locations simultaneously. The monovalent cation selective electrodes are in electrical communication with one another, and in fluid communication with one or more valves incorporated within a fluid path in order to introduce feed water/softened water to the monovalent cation selective electrodes. Additionally, one blending valve may be incorporated in the ion exchange column to allow a fraction of the feed (hard) water to mix with a fraction of the softened water. In this manner, the blending valve may be utilized to adjust the hardness of the water at the output.

A method of treating water in a water treatment system after a replacement of an ion exchange bed includes introducing water to be treated into the ion exchange bed of the water treatment system to produce treated water, calculating a current exchange daily average flow rate of water through the water treatment system, calculating a cumulative daily average flow rate of water through the water treatment system, and determining an estimated number of days remaining to exhaustion of the ion exchange bed based on the current exchange daily average flow rate and the cumulative daily average flow rate.

The present invention relates to a method for increasing the magnesium ion concentration of feed water. The method comprises the steps of providing an inlet flow of feed water (Q.sub.IN), increasing the concentration of carbon dioxide in said inlet flow Q.sub.IN to obtain a flow of carbon dioxide-containing feed water (Q.sub.CO2), and passing said flow Q.sub.CO2 through a solid bed comprising a magnesium ion source to obtain an outlet flow of treated water (Q.sub.OUT) having an increased concentration of magnesium ions. The invention further relates to a water treatment system for increasing the magnesium ion concentration of feed water and a corresponding flow reactor.

A chlorine generator apparatus wherein a housing is adapted to be mounted in an exterior, user-accessible surface of a spa and a chlorine generating electrode cartridge carrying a pair of electrodes is configured to be installable by a user in the housing and to thereafter be removeable by the user for replacement.

A tankless water heater including a water inlet, a water outlet, a conductivity sensor, a temperature sensor, and a heating chamber connected to the water inlet and the water outlet wherein the heating chamber is configured to heat a flow of water received from the water inlet and output the flow of water to the water outlet. The water heating system can further include a controller communicably coupled to the conductivity sensor and the temperature sensor, where the controller calculates an adjusted conductivity of a flow of water through the water heater.

An apparatus for determining total hardness in a fluid stream utilizing an ion exchange column in a monovalent cationic form having an inlet and an outlet, where one or more monovalent ion selective electrodes are positioned either at an inlet, outlet, or at both locations simultaneously. The monovalent cation selective electrodes are in electrical communication with one another, and in fluid communication with one or more valves incorporated within a fluid path in order to introduce feed water/softened water to the monovalent cation selective electrodes. Additionally, one blending valve may be incorporated in the ion exchange column to allow a fraction of the feed (hard) water to mix with a fraction of the softened water. In this manner, the blending valve may be utilized to adjust the hardness of the water at the output.

An embodiment provides a method for real-time management of device maintenance utilizing quality metrics defined based upon inputs of the device, the method including: receiving inputs corresponding to a particular device, wherein the particular device provides measurements of a parameter of a fluid; generating, from the inputs, quality metrics for and unique to the particular device; monitoring the particular device while the particular device is deployed, wherein the monitoring occurs in view of the quality metrics; and triggering, responsive to detecting information corresponding to the particular device is violating at least one of the quality metrics, a notification to a user to perform an action corresponding to the particular device.