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
https://www.amazon.com/dp/B0871LCK71?ref=nb_sb_ss_w_as-reorder-t1_ypp_rep_k0_1_10&amp&crid=2IP0VT1A4QVBI&amp&sprefix=hypertonic