Product review (1 stars): Not up to code, etc. etc.
Due to an improperly installed (and too long) vent pipe run leading to the great outdoors, our dryer took way too long to dry anything, much less towels. So, I bought one of these. I had a nylon knee-high hanging inside it (with two golf-balls to make it hang down to the water level), but I still had super-fine dust on everything in the room--and beyond. Be prepared for extra dusting (and a lot of it), since your heating and cooling system will spread dust from this thing throughout your house. We had a repair service in for the washer recently. When he saw this thing sitting in my laundry room, he said that the dryer sucks in air around it to do its job.  Since all the moisture from every load of laundry (could be more than a gallon of water from every load) is vented back out through the holes in this thing, the air is heavy and super moist for your dryer to try and make use of. No such thing as a "quick load" around here. Dry time was very extended, even for poly fleece items---towels and cotton underwear took FOREVER. The  repair guy suggested venting the dryer up into the attic--said he does it "all the time." We were all prepared for our contractor to start the work in the laundry room when he called to say everybody he talked to recommended NOT venting moist dryer air into an unfinished attic with exposed insulation. Our contractor said we'd have to sign a release for him to proceed.  Neither this indoor vent pot nor venting into an attic is up to code, so we'd have to do something before the house could be sold anyway.  Luckily, we do have a vent pipe leading outside, it was just non-functioning (or so we thought).  As of yesterday, we've got several hours into a search-and-destroy mission involving clods of solidified lint stuck about 20-24' out in a 32' run of (thankfully) metal venting (rather than PVC).  Perhaps if you have no other option, an indoor vent filter like this would at least let you have a dryer.  But, there's another one listed on Amazon that doesn't use water and has some fibery filters to keep micro-dust from filling your home and your lungs--looks far superior to me.