The domestic waste contains everything that goes down the drain into the sewer of the house. Suspended solids are soil particles (sand and silt), inorganic colloidal particles (e.g., clay) and organic colloidal matter (faecal matter, cloth, paper fibres, eatable waste etc.), dissolved solids (nitrates, phophates etc. and toxic metal ions) and pathogens.
Pollutants make water unfit for domestic and industrial use. For details.
