Applied Membranes, Inc.

Ashland Chemical Co.

Betz Dearborn

Bio-Chem Assoc., Inc.

Colloid Environ. Tech. Co.

General Chemical Corp.

Horner Discus Int'l. Inc.

MID AMERICA WATER TREATMENT

Mid South Chemical Co., Inc.

Ozone Pure Water Inc.

Pure Aqua, Inc.

Ques Ind. Inc.

Quint Corp.

Rochester Midland Corp.

Watcon, Inc.

Western Water Prod., Inc.