What is the difference between the mc7 and mc1? i have an rcc7 unit that i purchased 2 years ago

Hi Gregory, the the difference between the two membranes is the gallons per day produced; the MC1 will fill the ro storage tank a just a couple minutes quicker than the MC7. Either membrane is compatible with the RCC7.

When should this be changed?

It should last 2 to 3 years. However, I use a TDS meter to monitor pollutant levels. The water in Alpine, TX is not very good according to the TDS readings. I change my RO membrane twice a year and the other filters about every 3 months. I am probably a bit of a fanatic though. Check out 123filter.com for filter information. I stopped buying from Amazon because I got a better price and their customer service is awesome. Amazon customer service is excellent but 123filter is in the RO business. Very helpful for problem solving.

Are there any specific instructions? Do you have to run water through it awhile before using?

There will be specific instructions but in any case it is always a good idea to flush the system few a few minutes before using. The important thing is to keep the membrane wet. Tech support at isptings is awesome too.

Will this fit ispring rcc7ak?

Hi Elizabeth, Thank you for your question. Yes, this is the membrane filter used in the system rcc7ak. Thanks, iSpring Water Systems

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💧 Drink Smart, Live Pure — Because Your Water Deserves the Best

FITS LIKE A GLOVE - Standard 11.75" x 1.75" size ensures seamless replacement in most under-sink RO systems—upgrade without hassle.
POWERFUL PERFORMANCE - Delivers 75 gallons of purified water daily, perfect for busy households craving fresh, clean water on demand.
CONFIDENCE IN EVERY DROP - Backed by NSF/ANSI certification and lifetime tech support—your peace of mind is our priority.
PRECISION FILTRATION TECH - 0.0001 micron membrane pore size with 97% TDS rejection rate guarantees only pure water molecules pass through.
PURE WATER ZERO COMPROMISE - Removes up to 99% of 1,000+ contaminants including lead, chlorine, and fluoride for crystal-clear hydration.

The iSpringGreatwell Reverse Osmosis Membrane MC7 is a high-capacity, NSF-certified filtration cartridge designed to fit standard under-sink RO systems. Measuring 11.75" x 1.75", it produces up to 75 gallons of purified water daily by removing 99% of over 1,000 contaminants, including lead and chlorine, with a 0.0001 micron filtration precision. Ideal for health-conscious households seeking reliable, clean drinking water with lifetime support and warranty.

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