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Neptune By-Pass Feeders

Neptune By-Pass Feeders are a convenient method of introducing treatment chemicals into closed circulating water systems. Neptune By-Pass Feeders are ideal for treating hot and chilled water circulating loops used in heating and air conditioning systems, process heating and cooling or large engine water jackets. Neptune offers two styles of By-Pass Feeders: A vertical style with dish bottom in and a vertical style with dish bottom out. Filters are available for system cleanup and monitoring.

A high pressure cap rated to 300 psi is now standard. The first closure improvement in over two decades.

By-Pass Feeders – Vertical Style

Filter Feeder

The Neptune Filter Feeder combines chemical addition and high capacity filtering
in one piece of equipment. It is a convenient way to introduce solid or liquid
chemicals into hot or cold water closed circulating systems.

  • Eliminates need for separate By-Pass Feeder and filter.
  • Filtration can be achieved at the same time as chemical addition.
  • Extended neck with top inlet allows simple installation of filter bag and basket.
  • Filter bags are available in 50, 20, 5 and 1 micron ratings. (Order separately.)
  • Filter bags are quickly and easily replaced

Neptune’s FIRST Filter Feeder with Full Bottom Drain and Anchor Bolt Holes.


All Neptune By-Pass Feeders offer the new style, quick opening, high pressure closure. These closures offer better sealing with less force and eliminate the need for tools. Design binds cap tightly when under pressure making it necessary to bleed pressure from tank before removing cap. Underside of cap which contacts liquid is epoxy-coated.

Filter Bag Kits

Available for all “VTF” and “DBF” models up to 10 gallons. Kit includes bag, bag frame, tubing and connectors. The addition of a filter bag allows the By-Pass Feeder to function simultaneously as a side stream filter. (A clean bag is rated at approximately 30 microns.) Cannot be used with DBFC models.