Limewater & Southdown Paysand (B.C.)

[Scales]

I am relatively new to this board and am probably asking questions that have been canvassed before....since "pickling lime" is apparently unavailable in Canada (banned as a food additive), what are people sourcing in the lower mainland to avoid the cost of the LFS Ca products? Chemical supply companies?....and has anyone ever found this mysterious Southdown Playsand in B.C.?

Your patience and assistance is greatly appreciated....