Process to maintain large clean recreational water bodies

1. A process to implement and maintain a large water body, wherein the process

comprises:

(a) providing a structure with skimmers able to contain a large water body larger than 15,000 m 3 ;

(b) feeding the structure of step (a) with inlet water having iron and manganese levels lower than 1.5 ppm and turbidity lower than 5 NTU;

(c) measuring water pH, wherein the pH is maintained no lower than 5 and no higher than 9;

(d) adding an oxidizing agent to the water body contained in the structure of step (a), to maintain an oxidation-reduction potential (ORP) of at least 600 mV in the water body for at least 4 hours within a 48 hour cycle;

(e) adding a flocculating agent to the water body in concentrations within 0.02 and 1 ppm over a time period no greater than 6 days to precipitate impurities in the water to the bottom of the structure of step (a);

(f) cleaning the bottom of the structure of step (a) with a movable suction device to remove the precipitated impurities from the bottom of said structure, together with the additional flocculants; and

(g) generating a displacement of surface water containing impurities and surface oils by means of injection of inlet water according to step (b), which generates said displacement in such as way to remove said surface water using said skimmers provided in the structure of step (a), which together with step (f) replaces filtration to remove suspended debris from the water body.

2. The process of claim 1 , wherein providing a structure further comprises:

providing a bottom and walls made of low permeability materials coated with a non porous material;

providing a system for removing impurities and superficial oils using skimmers;

providing a feeding pipe system for introduction of fresh water; and

providing a feed water intake system.

3. The process of claim 1 , wherein the flocculating agent is a cationic polymer added in concentrations from about 0.02 ppm to about 1 ppm over a time period no greater than 6 days.

4. The process of claim 1 , wherein the flocculating agent is a cationic polymer added at a concentration of 0.05 ppm every 24 hours.

5. The process of claim 1 , wherein bromine salts are added to the water body if the pH is higher than 7.8.

6. The process of claim 5 , wherein the bromine salt is sodium bromide, and wherein the bromide concentration is maintained at values higher than 0.6 ppm.

7. The process of claim 1 , wherein adding an oxidizing agent comprises adding an agent from the group consisting of ozone, sodium persulfate, potassium persulfate, chlorine derivatives, hydrogen peroxide, bromine derivatives, and agents produced by electrochlorination.

8. The process of claim 1 , wherein treating the water to maintain ORP further comprises adding algaecides to the large body of water.

9. The process of claim 8 , wherein the algaecides are selected from the group consisting of quaternary ammonium salts and copper compounds.

10. The process of claim 9 , wherein the copper compounds have copper levels between 1 ppb and 1.5 ppm, depending on temperature and sunlight.

11. The process of claim 9 , wherein the copper compounds are added at copper levels of about 0.3 to about 1.5 ppm for temperatures between 10° C. and 30° C.

12. The process of claim 1 , wherein the inlet water comprises sea water, well water, spring water, or water from other sources.

13. The process of claim 1 , wherein the large water body is for recreational use.

14. The process of claim 1 , comprising adding the oxidizing agent to the water to maintain an ORP of at least 600 mV in the water for about 4 hours within a 24 hour cycle.

15. The process of claim 1 , wherein the large body of water is an outdoor body of water.

16. The process of claim 1 , wherein the oxidizing agent comprises halogen.

17. The process of claim 16 , wherein the halogen is bromine or chlorine.