OK, Sissy, I think you're concerned about the darker colored pad, which I said is more like a scrubbie, right? Well, it's made by True Blue, called a "budget washable air filter". Lasts up to one year or 12 filter washings. "2 times more effective than fiberglass filters. 100% synthetic filter". BUT, it also says, "will not support the growth of bacteria, mold, mildew or fungi in normal use." So, does that mean a pond filter is NOT normal use, and bacteria WILL grow on it? LOL
Does it sound safe now? As I said, one side of it is more open mesh, the other side is about 1/2" grid, all made with the same fiber, just different densities. I think this should work well as my first filter. I am going to try to find the buffing machine pads for another layer of filter, though! But, first I want your ok, if this sounds like a safe product to use.