Aquaria and ponds can be filtered using algae, which absorb nutrients from the water in a device called an algae scrubber, also known as an algae turf scrubber.
ɐkwˈɛɹiə ænd pˈɑːndz kæn biː fˈɪltɚd jˈuːzɪŋ ˈælɡiː, wˌɪtʃ ɐbsˈoːɹb njˈuːtɹiənts fɹʌmðə wˈɔːɾɚɹ ɪn ɐ dɪvˈaɪs kˈɔːld ɐn ˈælɡiː skɹˈʌbɚ, ˈɔːlsoʊ nˈoʊn æz ɐn ˈælɡiː tˈɜːf skɹˈʌbɚ.