Issue 10 and Volume 66.

QUESTIONS AND ANSWERS Conducted by NOTE—Readers of FIRE AND WATER ENGINEERING are invited to send in questions, which will be answered in the order in which they are received. Names are omitted from questions unless otherwise specified. Sulphate of Copper to Remove Vegetable Growth To the Editor: I have been reading with interest the information you have been giving through your Questions and Answers columns. If you can, conveniently, I wish you would answer the following questions or give me any available data on them: Is copper sulphate treatment effective in cases of other water troubles or growths than algae? Is there any other chemical which is not poisonous and which can be used for the same purpose? What effect has copper sulphate on animal life in stored water? What bactericidal effect has copper sulphate? How is copper sulphate applied and in what quantities? At what period of organism growth…

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