Product review (4 stars): Building in applicator would be nice.
This works well at keeping filters from developing any mold on them. Before, my filters would eventually get a pink mold growing them after a couple weeks. With this, that no longer happens even about a month in. The thing that could make this product better is it if came with some measured way of dispensing the right amount risking getting it on your hands (yes, I know you should wear gloves, but it would be nice if you didn't have to).