I ordered two bottles of Drain Shield, but was unable to get to the office to pick it up - so Mark delivered it. He explained how and why to use it. He was very professional and complete in his explanation. Very nice guy. I live in an old house, with old pipes, and this product is very helpful. (I have to say, for an old non-computer friendly person, it was difficult to get to this point - so I could write a review.)
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