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

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

Regular price $278.00 Sale

If water efficiency is your concern with reverse osmosis process and saving as much water as possible 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.

Please note that modern RO systems are highly efficient. 

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 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


  • Water Tastes delicious!
  • 36 / 50 / 75 GPD - Gallons Per Day (GPD) - Choose gallon capacity from the dropdown
    (we recommend to buy 50-75 GDP for residential and sm. commercial use)
  • This membrane requires a 200 mL flow restrictor. Order one if your system doesn't already have it. Contact us with questions.
  • 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
  • This membrane needs a flow restrictor to work properly

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. Use sediment and carbon pre-filters with this membrane to avoid damaging the RO membrane. 

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 to buy in bulk, 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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