EXHIBIT 23.5

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-4 of Ecolab Inc. of our report dated February 25, 2011 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears in Nalco Holding Company’s Annual Report on Form 10-K for the year ended December 31, 2010.  We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Chicago, IL

October 26, 2011