Original sentence: The cisterns are positioned so they gravity-feed a WOM (water organization module), that filters out bacteria and makes it suitable for drinking.Water used in an Earthship is harvested from rain or snow
Edited sentence: The cisterns are positioned so they gravity-feed a WOM (water organization module), that filters out bacteria and contaminants, and makes it suitable for drinking.Water used in an Earthship is harvested from rain, snow and condensation