Once the partly dealt with wastewater enters the drainfield, it starts to infiltrate the soil and percolate downwards. As long as the soil is suitable, the microbes during the soil digest the pollutants, removing the micro organism, viruses and excess nutrients by the point the water reaches the groundwater source. https://diffusedaeration14680.blogpostie.com/51039708/a-simple-key-for-continuous-filter-bed-cleaning-with-flow-sand-unveiled