pseudofeces
... that oysters deposit pseudofeces in such amounts that they can clean up an entire estuary?
... that <a href="./Oyster" id="mwXg" rel="mw:WikiLink" title="Oyster">oysters</a> deposit <b id="mwXw"><a href="./Pseudofeces" id="mwYA" rel="mw:WikiLink" title="Pseudofeces">pseudofeces</a></b> in such amounts that they can clean up an entire <a href="./Estuary" id="mwYQ" rel="mw:WikiLink" title="Estuary">estuary</a>?