Does what it says on the ‘tin’
I have used this stuff for years tried some others but pixie won’t have it. I notice people saying it stinks. I use a tray with a hood and give her plenty to dig in I only smell it when she is actually in the box. I do change her tray every two days, she would refuse to go otherwise! The tray is steeped in. Boiling water with napisan to remove any odours. I wouldn’t go longer than three days and don’t think you are supposed to.