A device is provided for metering at least one water-quality chemical in a water tank (1). The device comprises a metering duct (14) with an outlet port (16), a metering unit (13) for metering the water-quality chemical through the metering duct (14) and a control unit (12) which is connected to the water-quality sensor (10) and controls the metering unit (13), wherein the metering unit (13) and the control unit (12) are received in a housing (19) and a supply (17) is receivable in the housing (19) or connectable thereto and a carrier (9a; 9b; 24), to which a water-quality sensor (10) and an outlet port (16) of the metering duct (14) are fixed, is designed for insertion into the water tank (1), such that the outlet port (16) of the metering duct (14) is located downstream of the water-quality sensor (10).

A water treatment system is disclosed having electrolytic cell for liberating hydrogen from a base solution. The base solution may be a solution of brine for generating sodium hypochlorite, or potable water to be oxidized. The cell has first and second opposing electrode end plates held apart from each other by a pair of supports such that the supports enclose opposing sides of the end plates to form a cell chamber. One or more inner electrode plates are spaced apart from each other in the cell chamber in between the first and second electrode plates. The supports are configured to electrically isolate the first and second electrode plates and the inner electrode plates from each other. The first and second electrode plates are configured to receive opposite polarity charges that passively charge the inner electrode plates via conduction from the base solution to form a chemical reaction in the base solution as the base solution passes through the cell chamber.

Implementations of this disclosure are directed to systems, devices and methods for monitoring parameters associated with a body of liquid. In one embodiment, a device includes a container configured to be partially submerged in a liquid and includes sensors disposed within a submerged portion of the container to measure parameters associated with the liquid. An electronic component disposed within an unsubmerged portion of the container transmits information related to the parameters based upon which one or more actions related to treatment of the body of liquid are suggested.

The present invention relates to a method and system for controlling disinfection in recirculating water systems and a method for retrofitting a recirculation system.

A method of automatically controlling chloramine concentration in a body of water contained in a reservoir includes: (a) determining residual chloramine concentration in a water sample obtained from the body of water; (b) determining at least one of the following when the residual chloramine concentration is below a predetermined target chloramine concentration level: (i) an average rate of change in total chlorine concentration; and (ii) an average rate of change in oxidation-reduction potential; and (c) automatically engaging a supply of ammonia and a supply of chlorine to add both ammonia and chlorine to the body of water at a weight ratio of chlorine to ammonia of 5:1 or less when the average rate of change in total chlorine concentration is below a set rate of change and/or the average rate of change in oxidation-reduction potential is above a set rate of change.

This invention relates to a method for monitoring and controlling the relative concentration of bromide ion used in the cyclic process for enhanced sanitation and oxidation of aqueous systems at aquatic facilities.

A method of automatically controlling chloramine concentration in a body of water contained in a reservoir includes: (a) determining residual chloramine concentration in a first water sample obtained from the body of water; (b) automatically engaging a supply of chlorine to add chlorine to the body of water when the residual chloramine concentration in the first water sample is determined to be below a residual chloramine concentration set-point or a first chloramine concentration percentage; (c) determining residual chloramine concentration in a second water sample obtained from the body of water after step (b); and (d) automatically engaging a supply of ammonia and the supply of chlorine to add both ammonia and chlorine to the body of water if the residual chloramine concentration in the second water sample is determined to be below the residual chloramine concentration in the first water sample or a second chloramine concentration percentage.

A stable aqueous composition of sodium chlorite and a hydrated borate donor having a pH of greater than 9.0 and the weight percent ratio of sodium chlorite (reported as NaClO.sub.2) to hydrated borate donor (reported as the sum of H.sub.2O+B.sub.2O.sub.3) is less than 1.5:1 respectfully. A method of remediating an aqueous system using the stable aqueous composition.

Methods and systems for electrochemical treatment of fertigation water for use and for recycling in agricultural systems such as in controlled environment agricultural systems.

A method of automatically ensuring against chloramine contamination in purified product water includes supplying input water to the system and purifying the water to generate the purified product water. The purifying includes removing chlorine and chloramine contamination from the water using a carbon filter and supplying chlorine-depleted water to a deionization filter, and deionizing the chlorine-depleted water using said deionization filter. The product water is supplied to a sensor for continuous monitoring of the resistivity of the purified product water by the first sensor, and an alarm is generated indicating possible chloramine breakthrough when the resistivity of the product water falls below a predetermined resistivity level, which is selected to provide a reserve filter capacity before breakthrough would occur. The carbon filter is replaced at least responsively to the alarm to ensure excess capacity of said carbon filter sufficient to prevent chloramine breakthrough in said product water.