AMSTERDAM, N.Y. — Plumbing contractors install various systems over the course of their careers and doubtless hold equally various opinions on them. When they install one in their own home, however, it’s a statement that something about that system must be particularly advantageous, based on their experience. It’s the type of statement that Don Frederick Sr. recently made when he installed an above-floor macerator in his home’s basement.  Frederick has owned and ...

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