Backflow preventers are set up in the house’s main conduit to the sewer line and are designed to stop outbound sewage from returning into the house grid. The properties at Protection Island have their backflow preventers– all 350 of them– close to the sewer line. All went active in 1986.
A backflow preventer needs regular maintenance to ensure it is in top shape, even after some heavy days. A plumber in Manalapan can be tasked to do periodic service runs. However, the difficulties in taking care of preventers may warrant new approaches; according to Ricketts, there was a proposal for the replacement backflow preventers to be put up inside service boxes instead of digging to find them.
http://www.mrrooternj.com/808862/2014/02/03/replacing-backflow-preventer-networks-through-a-plumber-in-freehold.html
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