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I have no idea why they would recommend the ez pad over concrete...
Marquis and D1 are the only 2 companies rated with a low enough off gas to operate the ozone while the jets are on high!
Possibly because they sell ez pads, and make money off of them. Also possibly for the reason Stuart listed.I know of 2 ez pad installs, and both of them are on their 3rd Minnesoat winter and are in good shape so far. They're made by the company that makes Rhino Liner truck beds, so they should be of good quality.Brewman