(1) No water shall be discharged directly or in-directly from a swimming-bath into a sewer unless written permission to do so shall first have been obtained from the local authority.

(2) Any such written permission shall be subject to such conditions as the local authority shall determine, including, in particular, a condition that the permission may be revoked at any time on the local authority giving one week’s written notice of such revocation.

(3) No water from a swimming-bath shall, without the written permission of the local authority first had and obtained, be discharged directly or indirectly into a public drain.