(A) Permit the use of alum as a coagulant
(B) Increase the softening capacity of zeolite
(C) Facilitate easy regeneration of zeolite
(D) All A ,
(A) Permit the use of alum as a coagulant
(B) Increase the softening capacity of zeolite
(C) Facilitate easy regeneration of zeolite
(D) All A ,
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