NEW YORK ( TheStreet) - Honestly, I've heard the macro-economic case for investing in the water industry many times in the last half-decade. In fact, I've probably written my fair share of features, explaining how population growth is pushing demand at the expense of a limited, uncontaminated supply.

Yet, funds like PowerShares Water Resources ( PHO) and Claymore Guggenheim S&P Global Water ( CGW) have recently catapulted to the forefront of investor imagination. After struggling through the first half of 2010, the second half has been clear sailing.

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