Project Hydra utilized natural materials in creating the filter. Gravel and sand is used to filter and separate solid particle that are visible to the naked eye and activated carbon was used to adsorb pollutant molecules in the fluid to be treated are trapped inside the pore structure of the carbon substrate. Active charcoal carbon filters are most effective at removing chlorine, sediment, volatile organic compounds (VOCs), taste and odor from water. Typical particle sizes that can be removed by carbon filters range from 0.5 to 50 micrometers. The ratio of the gravel, sand and activated carbon respectively is 1000g:1500g:500g or 2:3:1.
After water has been filtered, it will flow towards the second reservoir and will be pumped upwards by the installed water pump towards the cistern or water storage tank.
Arduino is an open source electronics platform based on easy-to-use hardware and software. It is used to write the program for the electronic functions specifically the sensors and upload it to the board.