This ETF offers exposure to a group of companies operating generally in the water industry, including both water utilities, infrastructure companies, and water equipment and materials companies. As such, this ETF likely doesn't belong in a long-term buy-and-hold portfolio due to the targeted nature of exposure, but may be appealing to those who believe that scarcity issues will prompt increased demand for water treatment companies. While this investment thesis may seem compelling, it is not clear how strong the link between water usage/scarcity trends and performance will be going forward. Given the complexity of the issues, as well as the various other business operations of component companies, we're skeptical of the ability of this ETF to accomplish the objective investors may be expecting of it. Moreover, CGW faces some concentration issues, as a few individual stocks receive huge allocations, and it is on the pricey side. From the universe of water ETFs--which includes FIW, PIO, and PHO, this fund may be a good choice. But don't expect too much from CGW.