If this occurs you need prescription medication to counteract the nose drops. If the discharge continues to be colored, and there is fever and general feeling sick, then is the time to consider antibiotics. It never hurts to get a second opinion, then you can relax that you really do need the surgery. At least in our practice we don't overuse surgery since we spend considerable effort to avoid it, but sometimes there is no other way. The jury is still out as to the best concentration of salt solution to use.
Many patients do well on one teaspoon salt to a pint of water.
We use non iodized because some persons are sensitive to the iodine. ENTsol is nice because there is no silica in the product and the acidity is balanced. Use bed rest and warm applications to the sinus area when there are symptoms. Continue the pulsatile irrigation until the return is clear. This usually indicates return of function of the cilia.