Clarifier removes solids from Liquid and Clarifier removes solids from Gas

Lamella Clarifier is a particular brand of inclined plate clarifier. Their products are used to clarify and recycle by separating particles and dirt from unclean water.

From what I gather from reading the back of the bottle of Clarifier that I use in my pool a Clarifier is a Flocculent. The clarifier contains a polymer that attracts the smaller particles floating around in the pool that are too small to be filtered through some filtration systems. As the clarifier attracts the smaller particles it becomes large enough for the filtration system to filter it out of the water thus clariying the pool water.

Thickener of any substance adds to the substance making it more or bigger. Clarifier removes impurities or extra elements from the substance.

Basically, a clarifier is attached just after the purifier in the fuel line. While the main function of a purifier is to separate the dissolved water, impurities and sludge from the fuel oil, a clarifier removes any solid foreign material that is not removed from the oil after it passes through the purifier.