
I ordered these brushes hoping they would effectively clean the bottom of my Marina S-20 aquarium filter. I love this filter but it's really hard to clean. Since the brush set is made by the same company, I figured these brushes might be the secret to the sparkling clean filter. But it wasn't there. The stems are too flexible and the bristles cover the sides of the stem but don't reach the base. So when you try to clean the bottom of the filter, the base of the wand will hit the plastic and not the bristles. However, the smaller brushes are great for hose and pump cleaning, which is why I give the set 4 stars.

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