Black/Grey water after bleaching carbon
I just purchased a new home in florida that gets its water from a well. The previous owner has both a water softner and a large whole house carbon filter. Once a month the carbon filter says to perform a regeneration, in which i have to run a gallon of bleach through the filter. After I perform all the steps, which includes rinsing for 10 min, I get black/grey water for about 3 days. Does anyone know what this is? Is it safe to drink? Also, it leaves a black stain on my toliets that seems impossible to get off, does anyone know how to remove this. Any advice would be very appreciated. THanks.