I am told that Dolphinite is banned for use in Canada simply because it has not been approved for use by the Department of Agriculture. Apparently, the approval process is too costly given the relatively small size of the Canadian market. I am not sure why the Department of Agriculture has to approve a marine bedding compound.
I am also told that in recent years many products that were previously available for use in Canada are no longer available for the same reason.
As a sidenote, I recently bought new inflatable life jackets. At the time of purchase, I was told that they would never be approved for use in Canada because of the high cost of obtaining approval.
Something is wrong here.