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Greatwell MC7 Reverse Osmosis (RO) Membrane Replacement 75 GPD, 11.75” X 1.75”
$37.99
About this item
- Enjoy Your Water with Confidence - Our Reverse Osmosis membrane is able to remove up to 99% of over 1,000 contaminants from your water, including lead (removes up to 98% of lead), chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more.
- Tested by independent third-party to meet NSF/ANSI Standards, our Reverse Osmosis Membrane is made of food-grade material that provides high packing density to remove contaminants. With the 0.0001 micron size, it only allows water molecules to squeeze through and virtually nothing else. TDS rejection rate up to 97% (under NSF58 testing condition).
- Standard Size - With 11.75” X 1.75” industry-standard size, our membrane fits most standard under sink RO membrane housings. It has the capability of producing 75 gallons of water per day, ensuring that families of nearly any size will have plenty of clean drinking water available on demand.
- Peace of Mind Customer Service - Register online to activate your extended manufacturer warranty and life-time free tech support. We stand behind our products and if you encounter any problems with any of our products please reach out to us immediately. We are happy to help!
- Please note - There are wet & dry membranes in the market and the ones we sell are the dry version. Comparing to the wet version, the dry ones can be stored longer, are easier to preserve (no need of vacuum sealing), and don't contain preservation solution that needs to be washed off before usage. The membrane normally lasts about 2-3 years depending on your source water quality. If your water is very hard (Total Dissolved Solids level above 750 ppm), please contact us for customized solutions.
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Greatwell Reverse Osmosis (RO) Membrane Replacement 75 GPD, 11.75” X 1.75”
$37.99
- Availability: In Stock
- Model: MC7
- Manufacturer: iSpring
Reviews with images
Write Review
Shrenuj Jain | 
2016-12-08
The brine seal wasnt installed properly before it was taped on, it was slightly crooked, and leaking the source water into the waste water stream, reducing incoming pressure. I took the brine seal from a Filmtec membrane and installed it beneath the existing one, re-using the tape from the Filmtec, and now the thing seals properly. I suspect that most users would never notice it because this brand seems to be geared towards drinking water users who dont test their pressures or outputs.Even after fixing the brine seal issue, the product-waste ratio was much worse than DOW Filmtecs. Usually I get 4:1 waste/product with Filmtec, but this gives me 10:1 waste/product. I learned from an aquarium reefing forum that I can install a valve (needle valve would be better but its expensive, and I had a spare ball valve) on the waste line to increase the back pressure, and I now run this membrane at 2:1 waste/product. Im not concerned with the membrane life because the chloramine filters are far more expensive when running at high waste water ratios.Ill be spending an extra few dollars for a Filmtec next time because its not much difference in cost.UPDATE: iSpring kindly sent me a replacement membrane. The brine seal was aligned properly on the replacement but the rejection rate is still not as good as a Filmtec. However the latter issue is no longer a concern because of the valve installed on the waste line lets me adjust the rejection rate. Ive updated my rating.
2016-12-08
The brine seal wasnt installed properly before it was taped on, it was slightly crooked, and leaking the source water into the waste water stream, reducing incoming pressure. I took the brine seal from a Filmtec membrane and installed it beneath the existing one, re-using the tape from the Filmtec, and now the thing seals properly. I suspect that most users would never notice it because this brand seems to be geared towards drinking water users who dont test their pressures or outputs.Even after fixing the brine seal issue, the product-waste ratio was much worse than DOW Filmtecs. Usually I get 4:1 waste/product with Filmtec, but this gives me 10:1 waste/product. I learned from an aquarium reefing forum that I can install a valve (needle valve would be better but its expensive, and I had a spare ball valve) on the waste line to increase the back pressure, and I now run this membrane at 2:1 waste/product. Im not concerned with the membrane life because the chloramine filters are far more expensive when running at high waste water ratios.Ill be spending an extra few dollars for a Filmtec next time because its not much difference in cost.UPDATE: iSpring kindly sent me a replacement membrane. The brine seal was aligned properly on the replacement but the rejection rate is still not as good as a Filmtec. However the latter issue is no longer a concern because of the valve installed on the waste line lets me adjust the rejection rate. Ive updated my rating.
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