# US 10,118,849 B2 · Method and kit for treating recreational water > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,118,849 B2 - Document ID: US10118849B2 - Status: Granted - Kind: B2 - Application number: 14/261,679 - Filed: 2014-04-25 - Published: 2014-10-30 - Granted: 2018-11-06 - Earliest claimed: 2013-04-26 - Assignees: Arch Chemicals, Inc. - Applicants: Arch Chemicals, Inc. - Inventors: Michael Joseph Unhoch - Web page: https://patentgrep.com/patent/US10118849B2 ## CPC - C02F 9/00: Multistage treatment of water, waste water or sewage - A61L 2/00: Disinfection or sterilisation of materials or objects, in general; Accessories therefor - A61L 9/00: Disinfection, sterilisation or deodorisation of air (body deodorants A61Q15/00; purifying air by respirators A62B, A62D9/00; separating dispersed particles from gases or vapours B01D45/00 - B01D51/00, B03C3/00; chemical or biological purification of waste gases B01D53/34; production of ozone C01B13/10; air-conditioning systems incorporating sterilisation F24F3/16, F24F8/20) - C02F 1/004: {using large scale industrial sized filters} - C02F 1/5245: {using basic salts, e.g. of aluminium and iron} - C02F 1/56: Macromolecular compounds - C02F 1/76: with halogens or compounds of halogens {(C02F1/4674 takes precedence)} - C02F 1/766: {by means of halogens other than chlorine or of halogenated compounds containing halogen other than chlorine} - C02F 2103/42: from bathing facilities, e.g. swimming pools - C02F 2201/006: Cartridges - C02F 2209/001: Upstream control, i.e. monitoring for predictive control - C02F 2303/04: Disinfection - C02F 2303/16: Regeneration of sorbents, filters - C02F 2305/12: Inert solids used as ballast for improving sedimentation (C02F3/1226 takes precedence) - 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) - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) ## Abstract Provided herein is a method for reducing down-time in a recreational body of water having a water filtering system and water recirculation system after a potential release of Cryptospridium oocyst and/or Giardia cysts. Also described is a kit for practicing the method for reducing down-time in a recreational body of water that may have a potential release of Cryptospridium oocyst and/or Giardia cysts. ## Claims ### Claim 1 A method for treating a recreational body of water having a water filtering system and a water recirculation system after a release of Cryptosporidium oocyst and/or Giardia cysts, wherein the recreational body of water has an initial active free halogen concentration between about 1 ppm and about 8 ppm, said method comprising: (i) adding a halogenating agent to the recreational body of water to raise the concentration of the initial active free halogen to a level between about 10 ppm and about 100 ppm; (ii) adding an agglomeration aid to the recreational body of water at a level between 0.1 ppm and 3.0 ppm, adding a filtration enhancement aid to said filtering system, or adding both an agglomeration aid to the recreational body of water at a level between 0.1 ppm and 3.0 ppm and adding a filtration enhancement aid to said filtering system; (iii) recirculating water from the recreational body of water with said water recirculation system through said water filtering system for a period of time; and (iv) reducing the concentration of active free halogen to a level of between 1 and 8 ppm in order to return the concentration of active free halogen to a level prior to adding the halogenating agent. ### Claim 2 (depends on 1) The method according to claim 1, wherein the filtration enhancement aid is added to the water filtering system and the method further comprises back washing the water filtering system. ### Claim 3 (depends on 1) The method according to claim 1, wherein the agglomeration aid is added to the recreational body of water and the filtration enhancement aid is added to the water filtering system, and further comprising a step of backwashing the water filtering system. ### Claim 4 (depends on 1) The method according to claim 1, wherein the agglomeration aid comprises polyaluminum chloride; ferric chloride; cationic polymers selected from the group consisting of polyamines, polyacrylamides, polydiallyldimethylammonium chloride; aluminum sulfate and mixtures thereof. ### Claim 5 (depends on 2) The method according to claim 2, wherein the filtration enhancement aid comprises diatomaceous earth, cellulose, chitin, aluminum sulfate, perlite and mixtures thereof. ### Claim 6 (depends on 1) The method according to claim 1, wherein the halogenating agent is selected from the group consisting of sodium hypochlorite, lithium hypochlorite, calcium hypochlorite, chlorine, hypochlorous acid, bromine, hypobromous acid, N-chlorosuccinimide, sodium hypobromite, pyridinium bromide perbromide, N-bromosuccinimide, dichlorodimethylhydantoin, bromochlorodimethylhydantoin dibromodimethylhydantoin, dichloroisocyanurate, and trichloroisocyanurate. ### Claim 7 (depends on 1) The method according to claim 1, wherein step (i) comprises adding the halogenating agent in an amount to raise the concentration of the initial active free halogen to a level between about 20 ppm and about 40 ppm. ### Claim 8 (depends on 2) The method according to claim 2, wherein the filtering system comprises a sand filter, diatomaceous earth or a cartridge filter. ### Claim 9 (depends on 1) The method according to claim 1 wherein the concentration of active free halogen is reduced by adding a halogen neutralizer to the recreational body of water.