Algal Turf Water Purification Method. (Phosphorous precipitation in algal cell Walls) Algal Turf Water Purification Method. (Phosphorous precipitation in algal cell Walls)1–17Adey, Walter H. 1998. "Algal Turf Water Purification Method. (Phosphorous precipitation in algal cell Walls)." 5,851,398.More...ID: 92884Type: patentKeywords: NH-Botany; NMNH