Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.

Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.

Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.

Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.

Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.

Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.

Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.

Reprinted with permission from the April 1977 issue of Water & Sewage Works magazine. Prepared by Frank Reid and Harold Stone, Water & Sewage works staff.