AWC Water Solutions provides packaged water treatment plants based on the tube settler (ST) process. These plants use proven technologies to produce clear, safe drinking water from low quality sources. Capable of purifying the most difficult types of raw water, our ST plants are particularly suited for surface waters with high and variable contaminant loading and excel in treating cold water and very high levels of turbidity, iron and manganese.

Our ST plants are custom-designed to meet our clients’ needs. They can treat capacities up to 800 gpm (4,400 m3/d) per train (multiple trains can be combined for higher flows) and reliably achieve less than 0.1 NTU turbidity and 2.5-log, multi-barrier protection against Giardia and Cryptosporidium.


  • 1Flash Mixing
  • 2Flocculation
  • 3Clarification
  • 4Filtration

Flash mixing

A coagulant added to the raw water precipitates dissolved contaminants and encourages particles to form “flocs”.

  • Multi-chemical injection ports for coagulant, polymer, pH adjustment, etc. provides process flexibility
  • Static or powered mixers are options


Gentle agitation in the flocculation zone encourages the flocs to grow and they are then removed by settling within the clarification zone.

  • Multi-stage hydraulic or mechanical flocculation
  • Carefully designed to minimize short-circuiting
  • Hydraulic flocculation has variable nozzles for site adjustable energy input
  • Mechanical flocculators are fitted with variable speed drives


The accumulated solids are removed hydraulically from the clarifier bottom and the clarified water passes on to the filter for final polishing.

  • Inlet/outlet manifolds for even flow distribution
  • 60°, rigid plastic, settling tube modules, UV and chemical resistant
  • “V” hopper bottom for sludge thickening and hydraulic sludge removal
  • Sludge blanket sample and location ports
  • Flat bottom, mechanical sludge removal option available


Clarified water passes to the high-rate filter for final polishing and the filter is periodically cleaned by water or air/water backwashing.

  • Mono, dual and multi-media options
  • Options for increased iron, manganese and arsenic removal
  • Water backwash with surface wash option
  • Air scour/water backwash for reduced water consumption and improved cleaning
  • Nozzle and plenum-type underdrain

Plant Features

Quality tank construction

AWC constructs its tanks out of highly corrosion-resistant marine-grade, 5086 aluminum alloy. This construction eliminates the need for corrosion-protection coatings and prevents premature failures, which can occur with poor surface preparation or coating failures. Sacrificial anodes are used to further increase protection against corrosion. All fasteners in contact with the aluminum are 316 stainless steel to minimize galvanic corrosion. Stainless steel tanks are also available upon request. Our process equipment components can also be supplied for installation into site-constructed concrete tanks or retrofitted into existing tankage. In these circumstances, AWC can provide tank dimensions and other civil criteria.

Electrical systems and control panels

AWC designs, builds, programs and commissions fully integrated automated control and electrical systems. Our systems feature:

  • Integrated UL and CSA approved MCC’s and control panels
  • Fully automatic operation with advanced instruments and controls; provides automatic backwash initiation and sequencing
  • Remote monitoring, control and SCADA options
  • Industrial quality PLC’s with simple plug-in, pre-programmed modules for reduced training and technical support

Chemical systems

We offer a full range of chemical mixing and dosing systems, including solution tanks, mixers, dosing pumps and safety equipment.

Advantages of AWC ST Plants


Our plants are fabricated with marine-grade aluminum alloys that provide superior resistance to chemicals and corrosion, resulting in longer life.


Our ST plants are pre-assembled and pre-tested in our controlled facility, often saving 50 percent or more over in-situ construction. They can also be integrated into pre-engineered building systems for increased savings and reduced schedule.


Our ST plants are quiet, simple and easy-to-operate with minimal operator input. Inlet flow is set at a constant rate for uncomplicated system operation. In addition, the plants are supplied complete with chemical dosing, water quality instrumentation, automatic controls and monitoring systems customized to meet local needs. With minimal installation and connection requirements, projects run smoother and start up faster with fewer mix-ups.

Discover the power of working with the industry’s most experienced team.


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