The concept of slow sand filter

 is that of natural filtration occuring in nature.

And What is natural Filtration?

 The water emerging from  deep in the ground  may have fallen as rain many tens, hundreds, or thousands of years ago. Soil and rock layers naturally filter the ground water to a high degree of clarity/ Often it does not require additional treatment.

What's a Slow Sand Filter? And how to create one?S

Slow sand filters, due to their simple design, may be created as DIY,  Do It Yourself project.

Slow Sand Filters are Typicaliy 1-2 metere deep  Rectangular or Cylindrical tank with a loading rate of 200 to 400 litre/hr /m2 .Slow sand filters differ from all other filters used to treat drinking water in that they work by using a complex biological film that grows naturally on the surface of the sand. The sand itself does not perform any filtration function but simply acts as a substrate, that is providing  an underlying layer for micro organisms to grow and  form a bilogical film .So  slow sand filters use biological processes to clean the water. And these are are non-pressurized systems. Slow sand filters do not require chemicals or electricity to operate.

  Cleaning , which is equivalent to back washing in pressure filters, is traditionally done by use of a mechanical scraper, which is usually driven into the filter bed once the bed has been dried out.

  Slow sand filters are recognized by the World Health Organization,as being superior technology for the treatment of surface water sources. According to the World Health Organization, "Under suitable circumstances, slow sand filtration may be not only the cheapest and simplest but also the most efficient method of water treatment."

                                 Typical Configuration of a slow sand filtration system

And due to slow filtration rate ,Slow sand filters require more land space.

And we , at Trueline Water Technonolgies, help you create onein our compound.Connect to us at Web;http;//truelinewatertechnologies.business.site/ 

Fb; www.truelinewatertechnologies/facebook.com

email; trueline@rediffmail.com. Mob;9142744696

And know that Disinfection is generally  carried out along with primary filtration , which we were discussing in last two sessions.So our next session is Disinfection of Drinking Water.