Does reverse osmosis desalination of sea water remove viruses from the product water? Can Sulfuric acid or HCl be used with the addition of Citric acid for the control of iron and other scales in a reverse osmosis plant? When does it make sense to clean elements, and when is replacement the only option in high purity applications? Why does the RO permeate pH rise when the water passes through a degasifier? Does that higher pH really stabilize the RO permeate to help prevent corrosion in the distribution system?