how to define a water and secondary water in the boiler room
What Are the Three Stages of Wastewater Treatment?
There are three main stages of the wastewater treatment process aptly known as primary secondary and tertiary water treatment. In some applications more advanced treatment is required known as quaternary treatment. This stage deals with part per million to part per billion levels of contamination and often involves oxidation or fine filtration processes.
Primary/Secondary plumbing has been used for years in commercial and residential heating and cooling applications. In a radiant heating application a properly sized pump on the Primary Loop triggers the on-demand heater whenever any zone calls for heat. This creates a circulating loop of hot between the heater and a pair of closely spaced tees that intersect with a Loop.