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Old 11/10/2017, 09:47 AM   #1
JTL
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High TDS

I have about 40 TDS after my RO membrane and 200 from the tap. Needless to say I am burning up DI. The membrane is a 75 gpd Dow Filmtec membrane. I also just measured the output and it is not 75 gpd but more like 175 gpd, I only measured two cups per minute but extrapolated that into 24 hours. That is obviously not good. Also my psi after the prefilters but before the membrane is 40. My psi from the tap is 50. I am using a needle valve but I drilled out the hole to 1/4" to match the tubing on the RO. I also removed and reseated the membrane but it did not change anything. The membrane is only 4 months old and I have probably treated 500 gallons of water. I am not using a pressure tank or a float valve. I removed the ASO and now just manually turn off the water. I believe everything is plumbed correctly. The waste line is coming from the side of the RO canister and the treated water from the center. Any ideas?


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100 gallon DT and 50 gallon sump with refugium.
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Old 11/10/2017, 09:49 AM   #2
Buckeye Hydro
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Sure - would be best if you called us when you are in front of the system.

Dave


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Current Tank Info: 300 g mixed reef system
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Old 11/10/2017, 10:01 AM   #3
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Keep us posted on how it turns out.

Russ


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RO and RODI Systems and Supplies
Professional Water Treatment

www.buckeyehydro.com
[email protected]
513-312-2343

Current Tank Info: 300 g mixed reef system
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Old 11/17/2017, 09:35 AM   #4
JTL
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I received a replacement for the ro housing hoping that was the problem. Nope. I am still reading high tds after the membrane and the 75 gpd membrane is still producing more than twice that in filtered water. The membrane is pushed in as far as it will go so I am at a loss as to what is causing this. Could the membrane be plugged? I back washed it but that did not help. Can I take it out and soak it? Thanks


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Old 11/17/2017, 09:47 AM   #5
Buckeye Hydro
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If the membrane were plugged you would not be getting 175 gpd from a 75 gpd membrane. You seem to have the opposite problem - too much is getting through the membrane not too little.

Hopefully you have never "BACK washed" the membrane - you should NEVER run water through an RO membrane in the wrong direction.

Has the membrane been exposed to chlorine or another oxidizer?

Is the system plumbed incorrectly?

Again... might be best to CALL US when you are in front of the system.

Russ


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Professional Water Treatment

www.buckeyehydro.com
[email protected]
513-312-2343

Current Tank Info: 300 g mixed reef system
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