What sand to use in cat litter box

Again speaking as an owner of 8 cats, here's my advice on what sand to use for cat litter box.

There are 2 type of sands. Mainly

1. Low cost sand
Pros
- Cheap. Around RM 12 (USD 3) per box.

Cons
- Dusty
- Troublesome to dispose
- Not as effective in covering smell than higher cost sand


2. Higher cost sand

Pros
- Easy to dispose. Can flush the sand into toilet bowl without stuck.
- Example of flush-able user friendly type of sands are "Tofu litter", which I currently using

Cons
- More expensive. Around RM 25 (USD 6) per box (2.5kg)