What is reverse osmosis?

Reverse osmosis (RO) is the process of water being pumped under pressure through a semipermeable filter membrane.

RO systems filter water by forcing it through a thin permeable membrane that removes most solid contaminants and dissolved minerals but does not remove biological particles, such as bacteria or viruses.

Additionally, ordinary feed water can often contain a significant amount of chlorine, chloramines, copper, nitrogen, phosphates, silicates and other chemicals that are very hard on a sterilizer’s boiler.

A reverse osmosis system is the #1 recommended solution for standard carbon steel boilers.

Other purification options for carbon steel boilers

Another option for carbon steel boilers is the use of a water softener system.  These systems are a chemical treatment that reduces hardness, but can leave other impurities dissolved in the water, so is only applicable to customers who meet all water quality requirements except for hardness.

Does PRIMUS have a Reverse Osmosis System?

PRI Pure is PRIMUS Sterilizers reverse osmosis system


PRIMUS strongly advocates using reverse osmosis (RO) systems for purifying the feed water used in steam sterilization. PRIMUS data has shown that the use of a reverse osmosis system will minimizes boiler and sterilizer maintenance costs and maximizes uptime.

Click here to read why your water needs to be pure.

Ultimately, reverse osmosis (RO) is a filtration process that removes many types of large molecules and ions from solutions by applying pressure to the solution when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.

More Information

Water quality: why is it so important in a sterilizer?

Steam quality

PRIMUS water quality testing laboratory

Does my water have to be pure to use in my autoclave?

Have a question or having problems? Talk to Dave Schall, our PRIMUS sterilizer expert who is here to assist you anytime at 877.679.7800 extension 1212 or email at dschall@spire-is.com.

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