Sewage can be treated with algae, reducing the use of large amounts of toxic chemicals that would otherwise be needed.
sˈuːɪdʒ kæn biː tɹˈiːɾᵻd wɪð ˈælɡiː, ɹᵻdˈuːsɪŋ ðə jˈuːs ʌv lˈɑːɹdʒ ɐmˈaʊnts ʌv tˈɑːksɪk kˈɛmɪkəlz ðæt wʊd ˈʌðɚwˌaɪz biː nˈiːdᵻd.