Did you check the sds before using it? You know multiple suppliers ship to Canada right? A gallon goes a long way…so does a fiver. Arm and hammer is good but don’t leave it in your tank for more than a few days… It’ll turn brown on the top and kill your mix. Regular laundry detergent like sunlight/Gain works fine and it won’t turn brown after sitting around. But try ordering a real surfactant from a supplier in the states. It’ll be pricey but worth it.