Suspended solids (SS) is the amount of tiny solid particles that remain suspended in water and act as a colloid. The measurement of suspended solids is one way of gauging water quality.A water treatment plant is a destination where wastewater (water which is no longer fit for its current purpose) moves to once it leaves homes and businesses through sewage pipes. The sewage system contains miles of pipes below ground where wastewater flows to the treatment plant for processing.Public water systems often use a series of water treatment steps that include coagulation, , sedimentation, filtration, and disinfection.