What's the purpose of a gravel blockage of a mat filter?
On a picture in the German Wikipedia article of a mat/Hamburg filter I see a gravel blockage (plastic piece at the bottom of the fixation glued to the ground) and was wondering about its purpose:
(see de.wikipedia.org/wiki/Datei:Eck-HMF.png for license)
I don't find a notion of it in the article or any of the referenced websites.
I can't image anything going past the mat no matter whether there's the blockage or not.
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It's just to prevent gravel from sliding into the corner when the filter is removed for maintenance or to be replaced. Without it, a person would typically need to use both hands when changing the filter, 1 to pull and hold the gravel out of the corner, and the other to insert the filter.
As far as filtration functionality goes, it's irrelevant, it's just there to keep the gravel from interfering with installing the filter sponge.
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