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"Warren Buffett's Berkshire Hathaway revealed a new position in Nalco Holding (NYSE: NLC); it's my favorite pure play on water filtration," says Chris Mayer in Daily Wealth.

"With a $1.6 billion market cap, Nalco is a small-cap stock, but it's actually one of the world's largest water-treatment companies. Customers use Nalco's products and services to prevent corrosion, contamination, and the buildup of harmful deposits.

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"We see flowing profits from companies in the water sector involved with pipes, pumps, regulators and other equipment," notes Neil George.

In his industry-leading Personal Finance newsletter, the advisor offers a fascinating overview of three companies that help "utilities and other industries provide quality water service."

"Aging pipes are one of the most pressing challenges in the US and beyond. Studies show that in some municipalities, loss from leaky pipes accounts for as much as 10% of water consumption.