Neptune 5-Stage Reverse Osmosis Water Filtration Unit

$199.99 - $219.99
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Neptune 5-Stage Reverse Osmosis Unit
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  • Inline Sediment Cartridge (5 micron)
  • Carbon Cartridge (5 micron)
  • Carbon Cartridge (1 micron)
  • Refillable Resin Cartridge with Color Changing Resin
  • 50, 75 or 100 GPD R/O Membrane
  • Auto Shut-off feature
  • Pressure Gauge
  • UV Resistent Tubing (6 FT)
  • 3/4" Garden Hose Adapter
  • Check Valve
  • Flow Restrictor
  • Hanging Bracket
  • Maintenance Wrench

NEPTUNE 5-Stage (RO/DI) Reverse Osmosis / Deionization Filtration Systems have everything it takes to make RODI water with zero TDS readings without compromising efficiency and speed. 

Five stage RODI units come with either 50, 75, or 100 GPD membranes. All five-stage units come complete with a pressure gauge and an auto-shutoff system that allows you to link a float valve (sold separately) to the RO/DI line for automatically topping off water into a wet dry or sump.  

Quick connect fittings are used throughout the units for easy quick connect / disconnect maintenance. These systems may be run on city or well water supply and will remove all traces of chlorine, chloramines, and sulfides. 

Units come with 6ft of tubing for all three lines (Inlet, Product, and Waste), along with a heavy duty 3/4" garden hose adapter. Faucet adapters and under-mount sink adapters are also available for purchase.

The 5-Stage R/O unit is Neptune's top-of-the-line unit. Use it to top off your freshwater or saltwater aquarium, and for all other water filtration requirements.


Neptune (RO) Reverse Osmosis Filtration Systems are a unique series of professionally built water purification systems that focus on quality water production as well as user friendly operation and easy maintenance. Built with quality parts, they are designed to last for many years, producing the same quality water as they did from day one. 

Suggested Maintenance instructions:

  • Replace Membrane every year
  • Replace Sediment Cartridge every 1,500 gallons
  • Replace Carbon Cartridges when visually expended (see clear canisters)
  • Replace Resin when 3/4 has changed color