This is my reading just now post membrane and pre DI
It has been at 5-6 ppm since installed and holding.
It has been at 5-6 ppm since installed and holding.
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I was seeing TDS increase post membrane. Not anymore. I'm not on an automated system so unit does not discharge unless I physically turn it on. Details of temperature are in my thread. This is now a non issue for me since I brought the unit indoors and it it maintained at a controlled temp.@flyfisher2 I appreciate your response and that definitely seems like a reasonable response. All things considered, are you seeing a drop out in your TDS quality as being the factor that indicates the Membrane(s) going bad? In my situation I'm running dual 100gpd Dow membranes with 2 DI chambers on the back end. Additionally, there is the morning light which hits that area of the house where my RODI cabinet is, the rest of the day it just has ambient light.
Another thought - how often does your RO discharge into your output area? In my case, with it being a direct solenoid feed into my sump without a holding chamber - I have roughly 25-30 RODI discharges per day (from what I remember), with each discharge running for 3-6 minutes at a time. All things considered, the water actually in my RODI chamber is relatively new and one could say is "self-cooling" the RODI apparatus - whereby the external casing may get hit by heat but the internals are staying at a different ambient temperature.
Maybe this would be worth testing moving forward - what is the average ambient temperature of the water in your RODI system (and thus, your membranes).
Understood. So maybe for @leeatmg maybe you should consider implementing a temperature probe if possible some how into the RODI. You'd need to look up some options for how to mount a temp probe into the line but it may end up saving you money in the long run.I was seeing TDS increase post membrane. Not anymore. I'm not on an automated system so unit does not discharge unless I physically turn it on. Details of temperature are in my thread. This is now a non issue for me since I brought the unit indoors and it it maintained at a controlled temp.