Apparatus for controlled chlorination of water with an alkali metal dichloroisocyanurate

Claim 1

Apparatus for dispensing an alkali metal dichloroisocyanurate into a water supply to chlorinate the water, which comprises: (a) a housing for holding a supply of the alkali metal dichloroisocyanurate, at least the bottom of the housing being in contact with the water to be chlorinated; (b) a standpipe disposed within the housing, attached at its lower end to the housing bottom and extending upwardly therefrom, (i) the standpipe having at least one solution metering aperture located in its wall proximately to the attached lower end of the standpipe and at least one water inlet aperture located in its wall remotely from the attached lower end, and (ii) access of water from outside the housing to the standpipe interior being provided for by an orifice in the housing bottom; (c) means on the housing for use in supporting the housing in the water to be chlorinated so as to control the immersion depth of the housing in the water and thereby maintain in normal use water in the standpipe at a level sufficient to cover both the solution metering and water inlet apertures; and (d) a filter medium covering fitted over the standpipe exterior so as to cover the solution metering and water-inlet apertures in the standpipe wall; the rate of chlorination being controlled by provision of solution metering apertures of such size and number so as to provide and active chlorine concentration in the water supply of from 0.5 to 5 ppm.