1. Treatment Options for Rainwater Harvesting Systems For more information go to: www.cleanwaterstore.com: www.cleanwaterstore.com

2. Rainwater is in Abundance

3. Rainwater often used for non-potable water applications

4. Benefits of Rainwater Provide water for rural areas Reduce the dependence and demand of public water supply Reduction of water bills Additional water supply for fire protection or emergency use Reduce land erosion and flooding Reduce salt accumulation in soil which can be harmful to root growth

5. Rainwater quality affected by atmospheric contamination Carbon dioxide (CO2) levels - affect pH, creating acidic water Pollution from industry - industrial pollution such as sulfur dioxide Pollution from agriculture – pesticides and herbicides

6. Rainwater quality affected by roof or other catchment surfaces

7. Maintaining Roof Water Quality Regularly inspect and clean gutters, roof catchments and tank screens. Remove overhead branches and clear trees near roof. Consider installing gutter screens or guards. Ensure tank does not become a mosquito breeding site by preventing access and cleaning screens regularly. Examine tank for accumulation of sludge every year and remove by siphon or by empting the tank. Shock sanitize by adding 40 mm of liquid bleach or 7 grams of granular calcium hypo-chlorite per 1000 liters of water.

8. Basic Rainwater System with manual roof-washer

9. Basic Roof Washers

10. Commercial Roof Washer Valves The roof washer is sized to collect at least 30 liters of water for every 100 sq m of catchment area.

11. Commercially Available Roof Washer

12. Large capacity rainwater storage tanks

13. Polyethylene Tanks

14. Polyethylene tanks are light

15. Underground Tanks

16. Ferro Cement Tank

17. Water Quality of Rain Water

18. Rainwater Quality (Malaysia)

19. Typical rainwater LSI Corrosive water can cause heavy-metals such as lead to leach into water from: Fixtures Appliances Water heaters Brass fixtures Brass valves

20. Copper corrosion from rainwater

21. Langelier Index pH Alkalinity Calcium carbonate Total dissolved solids Temperature

22. Calcite – Calcium Carbonate

23. Calcite pH Neutralizers/Filter Systems www.cleanwaterstore.com/acid-neutralizer.html

24. Neutralizer with UV Sterilizer

25. UV Sterilizers www.cleanwaterstore.com/ultraviolet-sterilizers

26. Chlorination Liquid bleach chlorine feeder Solid pellet chlorine feeders http://www.cleanwaterstore.com/chlorinator.html

27. Ozone Treatment http://www.cleanwaterstore.com/ozone-systems.html

28. Corona Discharge Ozone Generator with Air Dryer

29. Ozone Bubbler with Compressor

30. Rainwater Collection Tank with Ozone Bubbler and automatic ORP controller

31. Ozone Bubbler in Outside Shed

32. Ozone Bubbler in Shed

33. Ozone Bubbler With UV and Calcite Carbon Filter System

34. Ozone Diagram with Contact Tank

35. Ozone Recirculation System with UV and Calcite-Carbon Filtration System

36. Automatic Controls ORP can be used to control disinfection

37. Filtration 50 / 5 Micron

38. Filtration 1 Micron

39. Ultra-Filtration www.cleanwaterstore.com/ultra-filtration