Looks like a good deal at first glance. It really isn't. The caps fall off on impact. The rubber pads fall off when you look at them. Given the quality, I'm wondering if it's activated charcoal or just black paper. Most likely not 0.5 microns. You can still install them and they offer some filtering. This product is definitely not NSF certified. However, it seems good enough for me to use the rest. However, I will not buy this product again.
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