The drain to the toilet bowl will be used as well, overflow in case it rains.
Again, this overflow can be in the settling tank, since the rim of the pond is only 10cm below the top of the settling tank, it's easy to drill a hole with a PVC pipe epoxied in. 90' down and release into a storm-drain.
Again, this overflow can be in the settling tank, since the rim of the pond is only 10cm below the top of the settling tank, it's easy to drill a hole with a PVC pipe epoxied in. 90' down and release into a storm-drain.