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How to Drain and Refill a Caldera Spa: A Step-by-Step Guide for Fresh, Balanced Water No matter how carefully you maintain your water, it eventually needs to be replaced. Every soak adds body oils, lotions, and dissolved solids that sanitizer and filters cannot fully remove, and over time the water becomes harder to balance and less pleasant to use. A scheduled drain and refill resets everything. With a Caldera spa, the job is straightforward if you follow the right sequence, and doing it correc … read more