Word: filter
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Concerning bacteria in the water, proper precaution would be assured by the filter and artesian well system, with the use of copper sulphate. The copper sulphate is a small item, as about four pounds in solution in the pool would suffice. The situation of the pool and its lack of sunlight would not affect the presence of bacteria materially...
...ingenious student in Chemistry 1, when the filter which he was using would not drain fast enough to suit him, remedied the defect by punching a hole in the filter...