The filtration of public water-supplies / Third edition, revised and enlarged.

by Allen Hazen

COAGULANTS WHICH HAVE BEEN USED.

In actual work sulphate of alumina is practically the only coagulant which has been employed, excepting the alums, which are practically its equivalent in action, differing only in strength. Nearly all important experiments upon the coagulation of water have been made with sulphate of alumina, and in the further discussion of this subject only this coagulant will be considered.