Environmental control apparatus, namely, particle activators for use in soil remediation, drinking water treatment, municipal and industrial wastewater treatment; External ballast and bilge water filtering and absorbing device for use in a local containment area for removing aquatic nonindigenous species, oil and other contaminants from the effluent; External filtering device for use in a local containment area for removing oil and other contaminants from storm drain effluent as it exits storm water systems; Filtering units for water filtering, producing potable water for domestic use; Industrial-water purifying apparatus; Metal cylindrical chamber and screen for use in filtering and removing settleable solids from liquid; Separators for the cleaning and purification of liquids; Sewage purification apparatus; Sewage purification installations; Sewage treatment plants; Thickening and dewatering machines for use in treatment of liquids including water, industrial effluent and sewage; Waste water purification units; Water conditioning units; Water filtering apparatus; Water filtering devices, namely, water purification installations for waste water and sewage consisting of curtains and textile fabrics; Water filtering units for industrial use; Water purification and filtration apparatus; Water purification installations; Water purification machines; Water purification units; Water purification, sedimentation and filtration apparatus for clarification, thickening and filtration of water, waste water and industrial water; Water purifiers; Water purifying apparatus; Water purifying units, for potable water for industrial use; Water treatment apparatus, namely, clarification and thickening machines for use in treatment of liquids in the nature of water, waste water and industrial water; Water treatment equipment, namely, chemical sterilization units