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Activate is a brand of MPS. There are several other brands you can be using, such as Renew or SpaGuard Spa Shock.MPS has several applications, one of which is working with Nature2. The packaging of Activate says it works with Enhance. Enhance is a bromine product. Bromine and nature2 are not compatable.My suggestion is to drain and refill. Then go back to your dealer's suggestion.I also suggest using dichlor once a week as the shock treatment you need to do with your Nature2 program.