You can tell by looking at the history of gutter guards and gutter covers what to expect in terms of their effectiveness--it's a natural progression. To read an article which provides this progression, click here. The amazing thing is that even though basic designs were invented years ago, i.e. screens--there are still new designs being invented today. It's like there's an addiction to making screens work and every year of so, someone comes out with a different screen design.
I find it amazing and ask, isn't that the definition of insanity--doing the same thing over and over again expecting different results? Sure they figured out how to make the openings so small that only water can penetrate and thereby keep debris out of the gutter, but they haven't figured out how to clean off the top surface of the filter or screen.
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