Product review (1 stars): I was having horrible sewer problems in my old Victorian
Totally misleading, in that you get just one pack of them, which contains two screens. And you can get these at any hardware store for $2-3, so this a RIP OFF. Having said all that, you really should use these buggers on your washer drain, and change them once per month. They really catch lint!

I was having horrible sewer problems in my old Victorian, and had to pay $400 to get the rooter people out once or twice a year. I couldn't figure out why. For years, this went on. Then a new sewer guy with a camera said, Gee this sewer has lots of gunky lint--do you use a screen? I had no idea what he was talking about. But a light went off, that maybe this was the problem. So I did what he said and started using these screens. The first week, it was clear they would prevent a ton of lint from going into the drain.

Bottom line: In the three years since I started using these screens--and yeah, you gotta change them once a month--guess how many visits I've had from the rooter guy?

Yeah, that's right. None.

I am not kidding, I spent thousands over the years on rooter service. Learn from me.