When I got the first unneutered tom this year, he came with some litter that I have never used before, and I couldn't smell he had only just been neutered till the bag ran out (luckily 2 days before going to his new home!!). I got another unneutered tom on Sun, so got someone to pick me a bag up today (still no car!!), and he used it as soon as I put it in, and I picked the tray up to have a smell, and very little smell, nothing like this morning (he was neutered yesterday). So it might not have been a one-off, and I will certainly be buying a bigger bag when I get the car sorted. It is Sophisticat Anti-Bacterial, I got some from a small pet shop, but have seen it in other places, although I can't think where now, and I don't know how much it is for a bigger bag, but will have some in for just in case, my bathroom will hopefully stop smelling now!! Thought I would share