Issue 15 and Volume 24.

ALUMINA AS A COAGULANT. ONE of the principal objections raised against mechanical filtration is that so much sulphate of alumina is used as a coagulant that the water becomes hurtful to the consumer. So much professional expert opinion pro and con has been expressed on the subject that it is refreshing to note some recent facts published relating to the matter. While there is no denying the fact that filtration by any process that will produce effective results is good for the community at large, the important considerations of how such filtration may be obtained the most quickly, at the least expense, and with guaranteed efficiency must be taken into account. The question of first cost of construction between the two systems of natural beds and mechanical comes prominently to the front, in connection with the main points to be settled—namely, rapidity in the action of the filters and absolute…

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