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SUGGESTIONS FOR REGULAR MAINTENANCE OF SEPTIC TANKS <br /> WHAT IS IN MY BACKYARD AND HOW DOES IT WORK? <br /> Most houses built in Orono after 1960, where city sewer is not <br /> available, have two septic tanks, one or more distribution boxes <br /> and a number of drainfield trenches . In the septic tanks, heavy <br /> sewage solids will settle to the bottom and be decomposed by <br /> anaerobic (oxygen-free) bacterial action. Floating solids such <br /> as grease, fat, and soap scum. will be retained inside the tank <br /> by baffles at the_ inlet and outlet. In many cases , the first <br /> tank will retain most of the solids' and the second tank merely <br /> provides extra settling time. This ensures that-the-effluent <br /> entering the drainfield is relatively free of solids which tend <br /> to clog up clay soils. <br /> TYPICAL SEPTIC SYSTEM. <br /> USEMENT <br /> Z.7.r_ r. <br /> C <br /> Floating _ <br /> Solids <br /> Sludge Distribution Box Drainfield <br /> WHY BOTHER WITH PREVENTIVE MAINTENANCE? <br /> Eventually, a septic tank that is functioning correctly will accumulate <br /> a large quantity of sludge (decomposed wastes) and floating solids . <br /> If this accumulation is not removed regularly, the solids will by-pass <br /> the baffles in the tank and will be flushed out into the drainfield <br /> causing premature and unnecessary clogging of the drainfield. The <br /> result: sewage will backup into your house and/or form a puddle <br /> (or river) ;Ln your yard. THERE. ARE NO INEXPENSIVE WAYS TO REPAIR A <br /> CLOGGED DRAINFIELD. <br />