I'd seen that video, which is why I ask.
Of course, that video is promoting a specific product, and therefore not reliable. While they may be telling the truth, I can't assume that there are no exaggerations or half-truths or other information that is withheld or inaccurate. I'm interested in similar information that's done impartially, even and especially if it corroborates that information.
Also, I believe someone on this forum had one of those filters and was selling it for some reason. I forget if they switched to something else and why, or if they just had an extra or were a retailer/advertiser, though.