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Post by h2otech on Aug 10, 2023 12:19:04 GMT
We currently have 2 millennium 300H portable ROs. A little back story on our problem RO- I got a call that the conductivity was >10us. Initially, I believed that the water temp was playing a role in that but upon further investigation, I noticed that the hardness on this RO was sitting at 3 and when staff was doing the manual regenerations, it never got below 1. I was not notified, and it had been this way for quite some time. I changed out the resin in the softener, hardness was fine after that however, the conductivity would not come down. Membrane cleaning was done and because carbon blocks were due to be changed, they were done as well. After all of that, we were still unable to get the conductivity below 10us. Membranes were replaced and disinfected. RO was allowed to run for the approx 4 hours and Conductivity remained between 8-10. We did see a period, on the day directly after membrane change where the conductivity dipped to 5 but was short lived. To put it in perspective, we are used to seeing anywhere between 5-7 conductivity on worn membranes. For example, our other portable has around 4 years on the membrane. We are seeing an incoming water Cond of 300, Percent rejection of 98% with a product cond of 6. Our problem membrane percent rejection is 96% with a product cond of 9-11. We have actually checked the conductivity of the product water and the reading is accurate. We have never replaced a membrane and NOT had more than satisfactory results. It is unusual for us to see a conductivity >4 and percent rejection <99% on a brand-new membrane. Could it be a faulty membrane? Any suggestions would be appreciated.
Thank you
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Post by Chuck Weddle on Aug 10, 2023 14:47:27 GMT
The conductivity display is temperature compensated so you were right in discounting that as a reason. However, if the temperature is high, it will increase the flux and allow more passage thus higher conductivity. You would see that on your other RO too though. If it is a bad membrane or o-ring your product water flow rate would be a little higher though, it may not be enough of a difference to really notice.
Have you sent an AAMI sample yet? If I remember correctly, the tap water out there is actually really good other than being pretty hard. I'm guessing that other than maybe sodium, no other contaminants will be detectable. Other than sodium, fluoride would probably be the first thing to be detectable. If there is any detectable, I would replace the membrane and o-rings again.
Emily has my number if you want to talk about it.
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Post by Chuck Weddle on Aug 10, 2023 15:16:56 GMT
I just thought of something..... I'm pretty sure the Millennium's had a product water recirc regulator. If the HX has one, it may need to be adjusted.
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Post by h2otech on Aug 11, 2023 18:43:02 GMT
I just thought of something..... I'm pretty sure the Millennium's had a product water recirc regulator. If the HX has one, it may need to be adjusted. AAMIs were all good. Not a single thing out of range. I may be reaching out to you on Monday. I'm at a standstill with this. I'm allowing staff to use the Portable unless conductivity goes above 10. It just doesn't make sense to me that the old membranes are outperforming the new. |
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Post by jadeddialysisbiomed on Jan 31, 2024 11:03:18 GMT
We are also seeing new membranes performing worse than old on the portables and even previously on our central. I believe there is a manufacturing quality issue with the membranes we receive now and would like to look at alternatives, as the vendor seems indifferent if a) you're not on contract and b) are a small facility. Open to suggestions.
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Post by Chuck Weddle on Jan 31, 2024 11:28:39 GMT
We are also seeing new membranes performing worse than old on the portables and even previously on our central. I believe there is a manufacturing quality issue with the membranes we receive now and would like to look at alternatives, as the vendor seems indifferent if a) you're not on contract and b) are a small facility. Open to suggestions. We've used these on our old Millennium RO's. Water Anywhere |
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