A water composition is adapted to be received and sealed in a container and includes water that is capable of being utilized by living organism, silicic acid and hydrogen gas dissolved in the water. The silicic acid of the water composition is present in an amount of not greater than a saturation concentration of the silicic acid. The water composition has an oxidation reduction potential (ORP) that is lower than −400 mV. A filter for producing the water composition includes a carrier and a silicon material adsorbed on the carrier. A filter assembly and a water purification system containing the filter are also provided.
