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I stay away from MPS and just use Dichlor with the Nature II. Read about to many problems with MPS on the boards. Go here and read Vermounters' style or Northmans' style they both us Nature II with out MPS.
WSD, not to pick nits , but I assume you meant MPS if you are getting in 30 min after a 3-4 TBS dose.
So you are recommending a weekly shock with Dichloro and a daily (after use) application of MPS.