Hello @jcwest211, You can order 7% saline from Amazon, no prescription needed. You could try that to make sure it works for you. Some people find it irritates their bronchial tubes but do fine with the 3%. What works best for me is 7% in the morning and 3% in the evening. As Sue @sueinmn mentioned the 7% will do a better job thinning the mucous and inhibiting growth of bacteria. Bill

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