Hi There, we have just built a house and new septic system. After about 5 months of use, a gallon of bleach was dumped down the drain and into the septic system. The septic tank capacity is 6,750 litres and the leaching bed is 16 metres by 7.5 metres. Has this done damage to the system that requires attention. If so, what action would be best to take? Thank you.