Q: Can I use Instachlor tablets to treat drinking water? What approvals or standards do the tablets meet? [caption id="attachment_7881" align="aligncenter" width="444"] Instachlor tablets for sterilizing water by chlorination[/caption] A: Yes - Instachlor tablets are compliant with the BS EN 12931 standard, for chemicals used to treat water for human consumption. The Instachlor tablet...