+ Start adding plain 8% store bleach, at the rate of 1/2 gallon per 10,000 gallons of pool water -- added each EVENING.

+ Read http://pool9.net/ma/, then buy a gallon of muriatic acid. Begin dosing at approximately 1/4 gallon per 10,000 gallons of pool water.

+ Tell us who's responsible for the pool: you or the landlord? Who pays for chemicals and maintenance.