CEA technologies include hydroponics, aeroponics, aquaculture, and aquaponics. Aeroponics used 65% less water than hydroponics. Aeroponic culture differs from both conventional hydroponics, aquaponics, and in-vitro (plant tissue culture) growing. One concept is to use photosynthetic gardens, possibly via hydroponics, or forest gardening. Plants can also be grown indoors through the use of hydroponics. So some food grown with hydroponics can be certified organic. Like perlite, pumice is a lightweight, mined volcanic rock that finds application in hydroponics. This property is useful in agriculture including hydroponics. The government has experimented in growing food through hydroponics and carefully managed farms. Some ingredients came from the ship's hydroponics laboratory. Wood fibres can be used as a substrate in hydroponics. Rock wool (mineral wool) is the most widely used medium in hydroponics. After searching the professor's cabin, Doland suggests the cabinet in the Hydroponics centre work cabin. Doland informs Lasky that someone has broken into their Hydroponics centre. Mel departs to investigate the hydroponics centre alone.