The document describes the design of a water purifier called Atlantis. It has several sections including pebbles/gravel, coarse sand, fine sand, a ceramic layer, charcoal, and cloth. Water passes through these layers which help remove impurities like algae, physical particles of various sizes, smells, and chemicals. The purified water exits with a total dissolved solids (TDS) level of 300 compared to the incoming water's 3000 TDS level. Maintenance is required every 6 months by two people and involves replacing or cleaning the various filter layers.