Biological filtration has not been historically accepted at least not in north america but it showed promise and is up and coming peterson and his group designed a water treatment system that uses naturally occurring bacteria instead of chemicals to remove contaminants from water and then treats the water a second time by reverse osmosis ro.
Tap water biological filtration.
Conventional ro systems using chemical disinfectants were attempted in the first nations previously but the ro membranes had to be replaced.
A biosand filter bsf is a point of use water treatment system adapted from traditional slow sand filters biosand filters remove pathogens and suspended solids from water using biological and physical processes that take place in a sand column covered with a biofilm bsfs have been shown to remove heavy metals turbidity bacteria viruses and protozoa.
When used correctly biological filtration is a major contributor to the health of your aquarium.
The biological process started to become popular for wastewater treatment in the early 1900s but not for drinking water treatment.
When cleaning your bio media only rinse it in tank water using tap water can kill the good bacteria due to the chlorine content.
Researchers concluded that the filter had a biofilm growing on it.
Recently some developed countries such as the usa canada greece croatia and china have applied the biodwt for clean and safe drinking water treatment but there have been very limited studies performed in developing countries.