10 reviews forUniversal Active Carbon Filter

Great aesthetically but design could improve: 1) The scoop is tiny and not effective at picking up unless your puss has micro-waste 2) the moulders corner 'feet' gather waste you can't pick up with a straight-edged scooper 3) the cat flap opening isn't a snug fit so doesn't stop smells.

Good size but quite flimsy. The filter doesn't do much either. Guess it's good enough for the price.

Good for large cats. More attractive than tray. Needs a cover over the filter to stop cat pulling it out. The lid does not fasten to the base so you can not carry the whole unit by the handle. Does reduce litter tracking. Not worth the money really.

Unlike the typical filters you get in a pack, these are terribly soft and getting them into the slots is a nightmare. They’re easy to cut and I think they work, but it’s really hard to fit them into the toilet, so that’s why I’m giving 3 stars.