Mustard algae can be a stubborn and annoying problem but fortunately there is a cure for mustard algae. A high quality algaecide should be purchased for a pool supply store and applied as per directions on bottle. Sweep the algae off the sides of the pool and around areas such as steps and ladders so that the algae is free floating and the treatment can kill it easier. Preventive maintenance is
. the best method for keeping mustard algae from your swimming pool. Keep all chemical levels balanced, shock regularly and do not introduce contaminate bathing suits or floats from other untreated water sources into your pool. Your brushes and nets should also be treated with algaecide before reintroducing to pool after an episode of mustard algae. For help with pool maintenance and more in depth information on mustard algae, go to http://www.poolmanual.com/manual/algae.html.