Thank you, that makes sense. but what about if it was allowed to drip directly onto a limestone chippings soakaway? Thoughno. because it is somewhat acidic, like fruit juice. I have seen a neighbour who let it drip onto a path and it eroded it away, leaving a hole with small stones in it from the concrete that were not eaten. You would not want it dripping into your foundations.
You can run it into a drain where it will be diluted by your bathwater; otherwise the limestone chippings to neutralise it. They will themselves be eaten away so need to be replenished periodically.