A filter sphere for preventing debris from entering a downspout of a rain gutter. The filter sphere is a hollow, perforated sphere with a diameter slightly less than the width of a normal rain gutter.

 
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> Device for mixing and distributing a gas and a liquid upstream from a granular bed

> Device for distributing a poly-phase mixture on a granular solid bed comprising a porous anti-splash nozzle element with flanges
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