What is wrong with my brs ro membrane?

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chris124

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I just replaced the membrane about four months ago and it seems to be failing again. My tap water has a tds of 89 and the membrane is putting out 8tds. But just a week ago I was getting just 3tds. I have been changing the sediment filter as soon as it looks dirty or a drop in pressure and I change the carbon block every six months. My unit is the BRS 4 stage plus ro/di system -75gpd. I filter about 40 gallons a month. Please help.
 
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chris124 said:
I just replaced the membrane about four months ago and it seems to be failing again. My tap water has a tds of 89 and the membrane is putting out 8tds. But just a week ago I was getting just 3tds. I have been changing the sediment filter as soon as it looks dirty or a drop in pressure and I change the carbon block every six months. My unit is the BRS 4 stage plus ro/di system -75gpd. I filter about 40 gallons a month. Please help.
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Do you know your rejection rate? @AZDesertRat should be able to help you
 
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I think my problem is my hardwater. So I might just have to start getting my water from the lfs again unfortunately.
 
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What is your water pressure, water temperature, tap water TDS, RO only TDS before the DI and final RO/DI TDS? Are you using softened water or if not do you know your calcium carbonate hardness? What is your exact measured waste ratio? Do you make treated water in nice long 5-10+ gallon batches or in small batches? Do you keep the RO/DI housings full of water when not in use?
If you know the tap water alkalinity and pH you can get a pretty good idea if you have CO2 problems or not.
 
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Water temp. seems such a very small TDS swing, Water temp can cause the membranes to be less or more efficient.
 
AZDesertRat said:
What is your water pressure, water temperature, tap water TDS, RO only TDS before the DI and final RO/DI TDS? Are you using softened water or if not do you know your calcium carbonate hardness? What is your exact measured waste ratio? Do you make treated water in nice long 5-10+ gallon batches or in small batches? Do you keep the RO/DI housings full of water when not in use?
If you know the tap water alkalinity and pH you can get a pretty good idea if you have CO2 problems or not.
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My pressure is 55 psi but it fluctuates between50 and 60psi because of the water company. Temp from the tap is 58F. Tap TDS is 77. RO only TDS is 9 inline TDS meter says 5 TDS but I dont trust it. RO-DI TDS is 0. I;m not using softened water. The carbonate hardness is 3 DKH or 53.7ppm kh. Wast ratio I would say is 1:3 to 1:4 ratio. I normally make about 30 gallons at a time and I do keep water in the housings when not in use. Is that right or wrong and how often should I be using it? Thanks.
 
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BRS sells a membrane flush unit to back flush the RO membrane. Have you tried back flushing after a couple uses. If you have high solids from well water it may need to be.
 
Well water is usually pretty good from my experience but also get a water report. Your water company should be able to provide it.
 
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MikeyAl said:
BRS sells a membrane flush unit to back flush the RO membrane. Have you tried back flushing after a couple uses. If you have high solids from well water it may need to be.
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Yeah mine came with one.
 
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