Capn,
You have to go over to the states and sneak it back into Canada. You cannot buy pickling lime in Canada.
I have used the slurry method for a while now. On a system with 450 gallons of water I add one or two teaspoons of kalk in a 1 litre jug and stir it up really well and dump it into the high flow area of the sump. On my system the 1-2 teaspoons a day (not every day but more often then not) does not really affect the Calcium or alkalinity levels at all but it does keep the pH from dipping under 8.0 and generally keeps the pH more stable, which is why I started doing it.
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