Filter Process Water Containing Nitrates Sediments Bacteria Treat Process Water in Real Time to Create: How it Works Concrete process water travels through the Hydro Carbonic Purification system to be treated with CO2, a patent pending reactor, a series of three carbon-based filters, and a UV treatment that greatly reduces nitrates, sediments, and bacteria.The pH of the process water is neutralized after treatment from the system and is considered potable recycled water that meets ASTM C1602/160