when first powered up it shows around 5100, then display changes to 'HI'. last reading was around 2700 so i added a bag. its a 10,000 gal inground pool. one bag wouldnt raise this high. recently cleaned the gen, it looks brand new. any thoughts? also, what would be the symptoms of a bad cell? thanks
10,000 gal pool, five years old, salt pool for last four years. hayward aqua rite t-15, hayward northstar pump, solar heat, de filter, tampa, fl.