Muriatic Acid vs Bacterial Health in Tank
My domestic water system is very hard (iron/manganese) and it's impossible to keep rust stains from forming on the porcelain toilet bowl. I've found the best cleaning solution to be 20º Baume diluted half and half with water. I remove as much standing water in the bowl and pour in a pint of this solution and let it stand for twenty minutes, then scrub and flush (1.6 gallons). I do this about once a month. This flows into a 750 gallon plastic septic tank.
How destructive is this to the biology of the tank? Would following this treatment with a dose of baking soda mitigate any bad effect? If so, how much to use? Or would it be smarter to not flush at all, use a bilge pump to empty the solution from the bowl and dispose of it somewhere else?
I just had the tank pumped and I'd like to maintain the best conditions until the next pump out.