RO System TDS PPM Shot up

[Car Wash Man]

In the last two months I noticed our PPM has gone up quite a bit for our RO system. We usually sat around 8-15. In the last couple months it has climbed up and is sitting around 36PPM. Kind of strange how fast it has gone up. Any advice? Membranes time to change??

 

[Timmb]

Yes!

 

[Greg Pack]

change your carbon first and then change your filter and membranes a couple days later(if timing permits)

 

[Car Wash Man]

Can someone educate me the differences between these two? I see they are different pressures. I have a sonys VROW-2 RO system with two membranes in this size membrane. Never dealt with RO membranes before so any help would be appreciated.

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[Wash Dragon]

The main difference between the two RO membranes is the operating pressure they are designed for.

• The low-pressure membrane is designed to operate at approximately 100 PSI.
• The high-pressure membrane is designed to operate at approximately 225 PSI.

There is also a difference in the stabilized salt rejection rate:

• Low-pressure membrane: 99.0%
• High-pressure membrane: 99.5%

I am not familiar with the specifications of your RO system, so I cannot determine which membrane is appropriate for your application.
However, the RO systems supplied by Hanna Car Wash Systems operate at a maximum pressure of approximately 195 PSI, so we would select the low-pressure membrane for those systems.