WASTE PUMP

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PLEASE EXPLAIN TO ME WHAT THIS PUMP DOES. wE JUST BROUGHT A NEW HOME AND THIS PUMP WAS INSTALLED TO PUMP THE WASTE IN THE 1/2 BATH THE OWNERS PUT IN ON THE FIRST FLOOR AS WELL AS THE FULL BATH IN THE BASEMENT. IT WAS WORKING FOR A MONTH NOW, WHEN WE TAKE A SHOWER OR FLUSH THE TOILET EVERYTHING BACKS INTO THE BASEMENT. DO YOU HAVE ANY IDEA WHAT THIS MAY BE?