Instructions Pour contents of bag into the bottom of terrarium. Depth of Vita-Sand should be 1 1/2" or less. Do not use under tank or heat pad type heaters if using more than 1 1/2" depth of Vita-Sand. Clean out debris as needed with sifter, litter scoop, or spoon. Replace Vita-Sand if foul or musty smell persists, or at least every six months. Warning If your animal has a propensity for consistent substrate ingestion, the manufacturer recommends that you: Check your husbandry by reading a good reptile book on your specific species, as this could be an indicator of other problems. Make sure you are using Zoo Med's ReptiSun 5.0 UVB or PowerSun UV Lamp with your desert species of lizard or tortoise. If consistent substrate ingestion persists, you may want to use Zoo Med's ReptiCage Carpet instead. Vita-Sand is not a replacement for dietary supplements. Made in USA.