Answer: scums

AnswerCrossword Clue
SCUMSStagnates, as a pond
SCUMSDirty films
SCUMSCovering of some stagnant pools.
SCUMSFeatures of stagnant waters.
SCUMSForms a film, as in fermenting.
SCUMSFilmy layers on some ponds.
SCUMSRemoves dross
SCUMSDrosses
scumsSCUM, to remove waste from
scumsfilm on top of a liquid
scumslow, worthless persons