A wee update: the standard aerator on a kitchen tap will have an M22 thread. A bush will be needed to take that up to 3/4 inch bsp for this to fit. I've been researching this and can not find such an adaptor anywhere. Not sure whether such a thing is manufactured. It is a shame as this would be a great item if it could be used indoors. Due to the fittings, however, I don't think it can be.