Here's who Taylor says to contact for Canada:

For all Canadian orders, contact Lowry & Associates in Newmarket, Ontario:
905-836-0505 (voice)
905-895-4539 (fax)
mlowry@lowryassociates.ca

I'm not sure the right Taylor test kit (I still have Ben's), but they'll have what you need.

What others have said is right though. You need to sustain the high levels to effectively kill off the algae and you can't judge 15ppm by the seat of your pants.

Jim