# US 11,999,637 B2 · Free chlorine maintained system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,637 B2 - Document ID: US11999637B2 - Status: Granted - Kind: B2 - Application number: 17/803,361 - Filed: 2022-05-31 - Published: 2022-09-22 - Granted: 2024-06-04 - Earliest claimed: 2018-09-07 - Assignees: King Technology, Inc. - Applicants: King Technology Inc. - Inventors: David Guy; Jeffrey D Johnson; Paul Freeberg; Terry Goeman; Lyle Enderson; Joseph A King; Randy Roseth - Web page: https://patentgrep.com/patent/US11999637B2 ## CPC - C02F 1/685: {Devices for dosing the additives} - C02F 1/76: with halogens or compounds of halogens {(C02F1/4674 takes precedence)} - C02F 1/66: by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) - C02F 2103/42: from bathing facilities, e.g. swimming pools - C02F 2209/29: Chlorine compounds - C02F 2303/185: The treatment agent being halogen or a halogenated compound - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## Abstract A method of maintaining a safe free chlorine level in a body of water for recreational use where the free chlorine level at a harmful level comprises determining if the free chlorine level in the body of water is above a safe level and adding sufficient DMH to the body of water to bring the free chlorine down to a safe level. ## Claims ### Claim 1 A set of dispensing cartridges for placing in a back-to-back condition in an inline dispenser comprising: a first dispensing cartridge having a bottom inlet and a bottom outlet and containing a time dispensable chlorinating agent therein; and a second dispensing cartridge having a bottom inlet and a bottom outlet and an immediate dispensable DMH therein in a sufficient amount to increase a concentration of DMH in a body of water to a level that reduces a free chlorine level therein to a range of 0.5 ppm to 1.0 ppm. ### Claim 2 (depends on 1) The set of dispensing cartridges of claim 1 including a further dispensing cartridge containing an algaecide dispensable into the body of water in response to a decrease of the free chlorine level to less than 0.5 ppm. ### Claim 3 (depends on 1) The set of dispensing cartridges of claim 1 wherein sufficient chlorine is dispensable into the body of water to bring a total chlorine in the body of water to a range of 3-10 ppm. ### Claim 4 An outdoor swimming pool free chlorine maintaining dispenser for use in an outdoor swimming pool body of water that has been sanitized with a chlorinating agent to render the body of water safe for human immersion and subject to a periodic bather load and environmental conditions, the free chlorine maintaining dispenser including: a first housing having a water accessible compartment containing a chlorinating agent releasable into the body of water to maintain a total chlorine level in the body of water above 4 ppm; a second housing having a water accessible compartment containing a source of DMH dissolvable in said body of water to maintain a level of DMH in the body of water above 10 ppm while maintaining a level of free chlorine in the body of water between about 0.5 to 1.0 ppm. ### Claim 5 (depends on 4) The free chlorine maintaining dispenser of claim 4 including a third housing having a water accessible compartment containing a source of an algaecide in solid form, said source of algaecide dissolvable in said body of water to kill existing algae and control algae growth in said body of water. ### Claim 6 (depends on 5) The free chlorine-maintaining dispenser of claim 5 wherein said third housing comprises a detachable third housing. ### Claim 7 A swimming pool free chlorine maintaining kit for use in an inline dispenser of a swimming pool body of water that has been sanitized with a chlorinating agent to render the body of water safe for human immersion and subject to a periodic bather load and environmental conditions, the swimming pool free chlorine maintaining kit including: a first dispensing cartridge having a bottom inlet and a bottom outlet and an immediate dispensable DMH therein in sufficient amount to bring a DMH level in the swimming pool body of water to at least 26 ppm; and a second dispensing cartridge having a bottom inlet and a bottom outlet and containing a time dispensable chlorinating agent therein to bring a total chlorine level in the swimming pool body of water when containing at least 26 ppm DMH to between 3.0 and 10 ppm total chlorine with the DMH level maintaining a free chlorine level in the swimming pool body of water to a range of 0.5 ppm to 1.0 ppm free chlorine. ### Claim 8 (depends on 7) The swimming pool free chlorine maintaining kit of claim 7 including a third dispensing cartridge having a bottom inlet and a bottom outlet and containing a time dispensable combination chlorinating agent and algaecide, the combination chlorinating agent and algaecide dispensable into the swimming pool body of water in response to a decrease of the free chlorine level in the swimming pool body of water to less than 0.5 ppm free chlorine to kill existing algae and control algae growth in said body of water while bringing the total chlorine level in the swimming pool body of water back to between 3.0 and 10 ppm. ### Claim 9 (depends on 7) The swimming pool free chlorine maintaining kit of claim 7 including a third dispensing cartridge having a bottom inlet and a bottom outlet and containing an immediate dispensable algaecide therein, the algaecide dispensable into the swimming pool body of water upon a sign of algae growth to kill existing algae and control algae growth in the swimming pool body of water.