It is water that does not contain residues or waste. The clear waters are the waters of the water supply or water for sanitary use. They are waters coming into the water supply of housing and can be treated by specific submersible pumps.
We talk about clear water also referring to rainwater or meteoric water and to those resulting from depletion of heating systems and that does not undergo any transformation.
The pumps that treat this type of water are usually equipped with filters to retain possible impurities or solid bodies.