It's a sponge filter. Pros and cons are considered on this page:
Caudata Culture Articles - Filters
In my opinion, it's not the best filter for an axie tank, due to the large amount of waste they produce. But if you don't mind spending the time to siphon the tank often, it would work.
What size tank are you using it for? I saw it had an 80 gph rating which might be considered high flow for an axolotl on a smaller tank. If you put it on a 40 breeder it would be just fine, on a twenty you might want a spraybar. My filter is supposed to have 220 gph on a 40 breeder, and I cram it with filter media, and have a huge spraybar, and it just works. I'm still thinking about making a better way to slow the current.
thats 8x the turnover rate and might be a bit much on a ten gallon. are you planning on upgrading? Putting it on a twenty gallon might be fine, are you planning on upgrading?
Sand or barebottom is best for axolotls, idk if you've seen any of the threads around about axolotl's eating gravel, but don't use gravel in your tank. This is just regular pure white sand right? It should work just fine for your axolotl. Playsand also works for axolotl's, and its really cheap. Mine isn't pure white, but it's a lighter sand and I think it costed me like $5.