is the manner of washing the filtering ma- each day is all the time required to keep a series of three in rule, a mixture of sand and granulated coke is the most ef- perfect order. And the washing of one filter does not inter- terial. fective filtering medium. . These filters are set up in serie»… … dred to one hundred and fifty Fig. 1—THE HYATT FILTERS. tank contains the cleansed fil- gallons per minute, and deliv- tering material. To return this ered it as clear as crystal. This to the filter, the supply valve is closed, the discharge valve, F, was done by a combination of chemical with…
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