Clear water pumps

When we imagine our hydraulic system, to choose the best electric pump, we must know well if we will work with clear water or dark water.
By"clear water pump" we mean domestic water, whether drinkable or non-drinkable, irrigation water, water subjected to chlorine treatment such as above-ground swimming pool water.

Water coming from the sea is not considered clear water, because due to salinity, it is very corrosive. We remember, therefore, that to move the water of the sea are used pumps made with materials suitable for this purpose.