Chlorine, chlorine, chlorine......and brush and vacuum! There is a product called "Yellow Out that is supposed to help with mustard algae, but the feeling around this forum (and from Ben....wish I could find the thread he wrote, but that was several crashes ago) that the Yellow Out treatment creates more problems than it solves. So....it may take higher levels of chlorine for the mustard algae than it does for the green, but chlorine will do it if you're persistant.

Janet