MasterShield Gutter Guard
Master Shield is probably the leading gutter guard manufacturer in the business. Their patented micro-mesh screens will filter out everything from debris to sand coming off the shingles. These mesh screens are placed on top of strong support ridges that are designed to duplicate the pitch of the roof, allowing wind and water to wash away anything that ends up sitting on top of the guard.
Since this guard is installed with the back of it under the first row of shingles, and the front of it sitting over the top of the gutter, there is nowhere for debris to get caught and start trapping other debris, as is often the case with other types of guards.
The support ridges under the mesh will also aerate the draining water, making it some of the cleanest water around. The result is that you will end up with rain water that is actually available for other uses. This design will also facilitate the siphoning away of water so that it can handle large volumes of water falling quickly.
This gutter system is also enclosed, so there will be no mosquitoes, birds, or anything else that will be able to contaminate this water once it enters the gutters. Their unconditional money back guarantee makes this product one of the best I have ever seen.