I think just about everyone has had a "water quality" person come to their door or call them. They will take a test tube of your tap water, add some black dye to it, the water will turn dark and they will tell you it is bad water and you need a whole house water filter costing several thousand dollars.
One of my friends had bought a re-sale home with one of those filters installed by the previous owner. The visitor came with the test kit and the water turned dark. It was one of their own filters. They almost ran out of the house when my friend told them and then showed them it was one of their own filters. YES, IT IS A SCAM.
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