Great post and info KenOTBC.
+1 on the
backwater valves. They are a very good investment and I seen first hand where a home was saved from sewer back flow because they had a valve in place whereas many neighbors were not so lucky...
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock