Mechanical Contracting & Plumbing January-December 1908 . and look as if they would last for alltime to come. They are 219 feet lojigand 11 feet deep, the foundation being8 feet wide at the base and 2 feet deep. The filtration beds alone cost $50, cover three acres, contain over 17,-000 cubic yards of slag, five feet deepand have over 600 sprayers to scatterthe effluent. In some systems coke isused for the filtration beds, while inothers the natural process of filtrationthrough sand is preferred. It is believ-ed, however, that the slag will prove asgood, if not better, than the sand. T
Mechanical Contracting & Plumbing January-December 1908 . and look as if they would last for alltime to come. They are 219 feet lojigand 11 feet deep, the foundation being8 feet wide at the base and 2 feet deep. The filtration beds alone cost $50, cover three acres, contain over 17,-000 cubic yards of slag, five feet deepand have over 600 sprayers to scatterthe effluent. In some systems coke isused for the filtration beds, while inothers the natural process of filtrationthrough sand is preferred. It is believ-ed, however, that the slag will prove asgood, if not better, than the sand. To guard against accident, there is athousand feet of overflow sewer, whichwill permit of the sewer being pumpeddirect into the bay at any time in caseof a breakdown. The chief feature ofthis system of treating sewage is thefact that it is so economically operated,the Hamilton plant requiring only twomen to operate. ELECTROLYTIC SEPTIC TANK. The new electrolytic septic tank justinstalled at Santa Monica, Cal. to killthe germs of animal and vegetable life. Costs 50 Cents a Day to Operate. in sewerage is claimed ^lo be entirely suc-cessful and only costs 50 cents per dayto operate. The tank consists of a pair of oou-crete chambers arranged parallel to 10 November 16, 1908. PLUMBER AND STEAMFITTER Warming and Ventilating Buildings W. H. Casmey, in Building Management. each other. In these chambers are twosets of electrodes of 10 units eaeh,charged with a strong- current at a lowvoltage. The sewerage enters at the up-per end of the chambers and in pass-ing between the electrodes all traces ofanimal and vegetable life are sewerage issues from the lower endalmost clear, in which condition it isemptied into the ocean 200 feet fromshore. The entire system, except the largereceiving lank, is contained in a rein-forced concrete room built below thelevel of the street. The sewerage is firstreceived in a large tank, from which itis pumped to the purification chambersin such qu
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