Darn Neven!!! As usual, once it comes to any form of CO2... you definitely have great understanding to it!
Anyways, agreed with Neven, care must be taken for, it's not the more the better, just make sure you're dosing correctly, and you can treat Metricide 14 like bleach... if you dun sniff and touch bleach, u dun neither with metricide 14 =)