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The best time to open your pool in Canada is when temperatures consistently reach 10–15°C, before algae has a chance to grow. Opening early reduces chemical costs, prevents green water, and makes balancing easier. This guide explains exactly when to open your pool and the step-by-step process to ensure clear, healthy water from day one.

The correct amount of pool shock depends on your pool’s volume, water temperature, and algae severity. In Canada, colder spring openings often require adjusted dosing. This guide shows you exactly how to calculate the right amount of shock—and when to safely double shock for best results.