Water is the most significant component for continuing life on earth. 71% of the world's surface is water-secured, and the seas hold 96.5 percent of all worlds’ water which is salty and can't be utilized straightforwardly. Water additionally exists in waterways, lakes, in icecaps and icy masses which is the crisp water asset on earth and can be made into utilization straightforwardly. The proportion of salty water to fresh water on earth is around 40 to 1. Anyway populace development and industrialization has brought about the incredible request of crisp water for various local, farming and modern uses. Also, the fresh water of the earth is distributed very unevenly. Fresh water lack issue has turned into a noteworthy issue nowadays thus desalination of the ocean water is the main choice left. In this correspondence, a test investigation of modified safeguard sun based still or IASS at various water profundity. Tests are led for the climatic state of Lucknow, Uttar Pradesh, India. It is discovered that the day by day profitability of the still is expanded when profundity of water in the bowl is 0.01m. The day by day efficiency of the still increment with increment of temperature distinction among water and glass spread. What's more, from the tests it is presumed that, when water profundity decline inside the bowl, heat limit of bowl water abatement and results in higher temperature inside sun oriented still and better dissipation and buildup produces improved distillate yield. The most extreme hourly profitability of the still for various profundities (0.01m, 0.02m, and 0.03m) is observed to be 6.604 kg/m2-day, 5.230 kg/m2-day, 4.736 kg/m2-day. From these outcomes it is affirmed that the 0.01m water profundity is the ideal for greatest efficiency of the sun based still. The hypothetical outcomes acquired from the diagnostic arrangements are in great concurrence with the trial results. Greatest normal day by day distillate yield is observed to be 6.604 kg/m2-day. The ideal water profundity of 0.01m upgraded vanishing and buildup procedure and increment the yield rate, because of the enormous temperature distinction among water and glass spread. It is affirmed that the effectiveness of the still is expanded when profundity of water layer in the bowl is diminished and momentary of warmth extraction. The greatest normal quick proficiency of the sun oriented still with various profundities (0.01m, 0.02m, and 0.03m) is observed to be 39.85%, 31.63% and 28.58%.