The small-to-medium-sized reverse osmosis membrane desalination solution is designed to efficiently desalinate seawater by removing impurities, bacteria, and algae before filtering it through a high-pressure reverse osmosis membrane. This process significantly reduces the salt content of the seawater, lowering the Total Dissolved Solids (TDS) from approximately 36,000 milligrams per liter to about 200 milligrams per liter. The resulting desalinated water surpasses tap water in quality and is ideal for a wide range of applications including island living, marine vessels, fishing boats, offshore operations, industrial and commercial uses, residential needs, and military ships and vessels.