My mother in law had a pool company let her pool get infested with mustard algae as a result they were fired and I am now the one appointed to taking care of the pool I have never taken care of a pool before so I'm clueless. we brought a sample of water to a pool supply store and there was no chlorine and we had to add acid as well then a lot of algaeside (sp?) It's been over a month of adding and scrubbing it has gotten better but there is still lingering algae that refuses to leave I am hoping some experienced pool keepers can help me maybe give some advice to speed this up thanks