“One of the most cost-efficient methods of catching and storing rainwater is to use rain barrels attached to a home’s gutters and downspouts. As some experts agree, an effective rain gutter system is needed to ensure that water can flow freely through unclogged gutters, and get into the barrels with as little debris and contaminants as possible.
A high-quality rain gutter guard, such as those developed and installed by Gutter Helmet®, can filter out fine debris. These gutter covers make use of the right materials and construction to ensure rainwater cling to the gutter’s surface until it is released onto the gutters. By using products like Gutter Helmet, households can collect and store enough filtered rainwater that may then be used for outdoor purposes.”
http://www.gutterhelmet.com/blog/effective-rain-gutter-system-can-help-households-conserve-water/
Gutter Helmet 
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