Subject to the prior approval of the Director, waste
lines from a swimming pool shall be connected into a sanitary sewer,
and discharge of wastewater from a swimming pool into the sanitary
sewer shall be restricted to the period between 12:00 midnight and
6:00 a.m. The size of the discharge line at the point of connection
shall not, in general, exceed four inches and may be further reduced
by the Director in his discretion.