Yes, that looks like great stuff!
We have a dwarf bun who uses a rectangular litter box of about 30*40 cm. We only use a small amount of litter each time we fill it, just enough to have a single layer covering the bottom. Then we cover the pellets with a layer of hay for comfort. The pellets swell up when they take up moisture, and if we don’t use a thin layer he’ll end up sitting on a mountain (and peeing over the edges).
We change the litter box 3-4 times a week, and a 10 L bag lasts us approx. 5-6 weeks because we use such a small portion each time. It’ll depend on your brand how much moisture it absorbs and how much you’ll need to use to keep things fresh for a day or two.
Regarding litterboxes it’s better to change it more often than to use more material so that it’ll last longer. Especially in warm/humid weather flies will lay eggs in the poop, and this can give the rabbit a possibly lethal infection. If you choose a material which absorbs well, it should be an easy chore to change it frequently. Changing often also reduces the typical ammonia-smell, because the urine hasn’t had much time to be broken down by bacteria.
I was really happy when we finally trained Breintje to only go in his box, instead of just using the whole cage like he used to do at my BF’s place. Cleaning the whole cage all the time was a real back-breaker for me. Now it’s become a 5 minute chore ^_^ Our material absorbs really well and it’s super easy to scoop out the box. I can literally flip it over into a rubbish bag, and everything flops out. Quick rinse with hot water and an old dishwashing brush. Dry with an old towel, and refill.
Nothing works better for getting rid of pee smells than plain old cleaning vinegar. The unscented variety is a rabbit-safe cleaning product and it works great to get any ammonia smells out: the trick is in its acidity which breaks down the alkaline ammonia. I use a spray bottle with undiluted vinegar and gloves to protect my skin. Rinse the box well afterwards, because your rabbit probably won’t like the smell.
Cleaning vinegar also works great to clean up “accidents” on carpets, sofas etc, it’s quite textile-friendly. As said, rabbits don’t like the smell, so if you leave bit on they’re not likely to go there again. Always test it out on a piece of fabric which doesn’t directly show. Because of its acidity it’s best to avoid using cleaning vinegar near marble, limestone or unglazed tiles. These materials are very susceptible to acid damage and you may create stains which can last.
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