Low cost and sanitary efficient method that creates two different treatment zones in large water bodies to facilitate direct contact recreational activities

A method for providing a large water body suitable for direct contact recreational purposes, the large water body having a surface of at least 3,000 m2, a sedimentation zone and a dissipation zone not separated by a physical barrier, wherein a ratio between a volume of water contained within the dissipation zone and a volume of water contained within the sedimentation zone is from 1:2 to 1:40, the method comprising:

• applying a disinfection method based on a concentration-time index (CT index) into the volume of water contained within the sedimentation zone, wherein the CT index requires that the sedimentation zone is treated by adding disinfectant agents to achieve a specific concentration “C” (in mg/L) of the disinfectant agents during a minimum contact time of “T” (in minutes) in the volume of water contained within the sedimentation zone, and wherein the disinfection method is performed such that the disinfectant agents are applied to the volume of water contained within the sedimentation zone so that the CT index is at least 42 every 72 hours;
• applying an efficient amount of a flocculant composition into the sedimentation zone, and maintaining flow and circulation of water within the sedimentation zone to allow sedimentation;
• adding an efficient amount of chlorine so that at least a 0.5 mg/L free chlorine level is maintained in the volume of water contained within the dissipation zone;
• injecting inlet water to the dissipation zone by means of one or more inlet nozzles that along with natural currents produced by winds and/or water temperature differences, have a capacity of generating a water dissipation pattern of the volume of water contained within the dissipation zone into the volume of water contained within the sedimentation zone, and
• wherein the dissipation zone is arranged and configured to achieve a Contamination Reduction Index (CRI) of up to 30 minutes.