These are the standard fabric colors.  Charcoal, Green, and Royal Blue have been the most common choices.

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Ellis Pool Covers Inc. ◦ Sales, service, and local distributor of automatic swimming pool covers in Southeastern New England, (Massachusetts) USA ◦  14 Roberts Road Plymouth MA USA, 02360 ◦  (508) 746 1701 ◦  Fax (508) 746 1702