Y'know, maybe for one or two cats, but 7? I'm not so sure. I think I'd need at least 3 of them and that just isn't practical. I'm also wondering if some of the litter escapes and gets flushed away, too. I have a septic tank and sure don't need the grief of having a backed up septic. If I had only one cat, though, I might be tempted to give it a try.