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PENTAIR GRO-36EN, 50EN, 75EN - 1:1 Ratio Super High Efficiency, Encapsulated Reverse Osmosis Membrane -

PENTAIR GRO-36EN, 50EN, 75EN - 1:1 Ratio Super High Efficiency, Encapsulated Reverse Osmosis Membrane

Regular price $180.00 $168.00 Sale

If water waste is your concern with reverse osmosis process and saving water is your goal, Pentair™ GRO-75EN (Also available in 36EN and 50EN GPD) Reverse Osmosis Encapsulated semi-permeable membrane is a high efficiency, 36-75 Gallons Per Day (GPD) reverse osmosis membrane that reduces water waste by over 50%.

Pentair Residential Membranes use an industry leading state-of-the art TLC (Thin Layer Composite) membrane providing high quality water for a broad range of water chemistries. Each membrane is required to meet our factory's strict performance requirements prior to shipment. Encapsulated membranes already come with quick connect fittings on the housing. These membranes use less waste water with a near 1:1 ratio which means 1 gallon of RO water to 1 gallon of waste. 

Reverse Osmosis is the process by which water molecules are forced by your household water pressure through PENTAIR semi-permeable membrane. Contaminants are rinsed to the drain with a reverse osmosis water purifying system, while your high quality drinking water is stored in the holding tank ready for drinking on demand. There is no contamination of drinking water with impurities.

Video below shows how 1:1 water ratio / high recovery rate works using Pentair GRO-75EN



  • Tastes delicious and pure!
  • 36 / 50 / 75 GPD - Gallons Per Day (GPD) - Choose from dropdown
    (75 GDP recommended for small office, 36-50 GDP recommended for residential usage)
  • This membrane requires a 200 mL flow restrictor
  • Double the recovery rate - 1:1 Water Ratio!
  • High rejection stability at high input TDS 
  • TDS reduction of 93-98% of minerals, salts, contaminants in your potable water
  • Thin Layer Composite Membrane (TLC)
  • 100% dry membrane maximizing shelf life (indefinite shelf life)
  • Available with or without a drain line flow control
  • Capillary style drain line flow control kits available and sized for each GRO mode supply. 
  • Innovative Design
  • 2 Year Warranty
  • Conserves Water
  • Saves Money


Pentair Gro Brochure
Pentair Gro System Retrofit Kit
Pentair Gro Limited Warranty / FAQs
Pentair Gro System Retrofit Kit (French)
Pentair Gro System Retrofit Kit (Spanish)


  • Maximum Pressure: 125 PSI (6.90 bar)
  • Maximum Temperature: 120o F (49o C)
  • pH: 4-11
  • Free Chlorine: 0.1 ppm

Filters and membrane elements are not to be installed on microbiologically unsafe water supplies. TLC Membranes are not certified to sanitize water, remove cysts, bacteria, or viruses. Filter and membrane element performance can be affected by fluctuations in water quality.

In order for this membrane to provide 1:1 water ratio, you need a flow restrictor. Please choose a membrane with flow restrictor included from the dropdown above or if you need bulk orders, follow the link here flow restrictor

4004446 Kit | GRO-36EN | 100 ML/MIN 25
4004447 Kit | GRO-50EN | 150 ML/MIN 25
4004448 Kit | GRO-75EN | 200 ML/MIN 25

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