Dear Valued 3M Purification Inc. Customer,

Please accept this letter as official notification that pricing for Aqua-Pure branded water

filtration and water treatment products will become effective February 15, 2010. All

current 2009 pricing will remain intact until the end of the business day February 14,

2010. The 2010 price book will ready and available for distribution by January 15,

2010.

The effective date for our commercial & industrial water treatment products price book,

as well as our replacement parts price book, will be January 15, 2010. These 2010

price books will be ready and available for distribution by December 15, 2009.

As a reminder, the MacCLEAN and Purwater branded water treatment and water

filtration products, respectively, will be made obsolete effective December 31, 2009.

In closing, we would like to thank you for your continued support in 2009 and wish you

a very happy, healthy and prosperous New Year.

Sincerely,

Sales & Marketing

3M Purification Inc.