Soft Soak is a baqua based system. Since we are talking about a spa and not a pool, I would start with a drain and a thorough rinse. Then replace the filters and refill. Then run a full series of tests and use the Pool Calculator (link in my sig) to determine the appropriate dosage of chemicals for your spa's water volume. Focus initially on FC, pH, and CYA . Recommend using plain liquid bleach as your chlorine source. Since your spa will be outside, don't forget to add some stabilizer (CYA).
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