I have Amazon prime for Canada. Here is the message I got when I try to buy what you linkedDo you have access to Amazon Prime? This is the stuff I like - called Puri Tech and I use them for CYA and Calcium Hardness Increaser. Pure stuff, priced fair and quick shipping (in the states) Amazon.com : Puri Tech Stabilizer Conditioner Cyanuric Acid UV Protection for Swimming Pools and Spas (25lbs) : Garden & Outdoor
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