Kao Nyantomo Clean Toilet

One of the two great systems that rule the Japanese market, and a litter that thinks in layers. Kao's Nyantomo Clean Toilet pairs large deodorising chips with an absorbent sheet beneath, the urine falling through to be locked away below, and it arrives at No. 34 with seventy two, a card led by a single perfect score.

Dust is flawless, a five, the large chips pouring with virtually nothing in the air, among the cleanest experiences on the list. Clumping, scored on how completely the system captures and holds rather than on a traditional clump, comes in at a strong four, and tracking matches it, the big chips far too large to ride out on paws. This is a near hands off, low mess way to keep a box, and its huge domestic following is well earned.

The markings then turn honest. Odour is scored at three, good but, on this bench, climbing by the middle of the cycle as the sheet fills, and sustainability at two, the unavoidable cost of a system built on disposable sheets, a plastic frame and throwaway chips. It is convenience bought with waste.

What you are buying is Japanese engineering applied to the litter box: a clean, low effort, low dust system from one of the country's most trusted houses, locked for years in a battle for first place with Unicharm's Deo Toilet. It is the choice for the owner who wants minimal daily fuss and immaculate air, and who will accept the disposables and the mid cycle odour climb that come with the format. A clever, convenient system, and a genuine pillar of the world's most sophisticated litter market.