1 liter is a little more then 32oz so 3 ml in the quart bottle is what I do. I wash then dry then soak the tubs and let them sit for 15 minutes. then I dump out whatever remaining liquid is there and done. the instructions say leave it soak for 10 minutes I just leave em for 15. I do the same for the water bowls but I rinse them with fresh water after the f10. the tubs I just pour out and that's it.