Not sure I completely understand you description of events but as long as the water did not go from the tap directly through the RO membrane first, you should be fine. Chlorine and chloramines will kill the membrane if it did not go through the carbon stage first.
So it doesn't really matter what order the water goes through the sediment and carbon filters?
It does actually matter but not for something that short term. It will make alot of difference with the longevity of the carbon if it's the first stage. Best to get the larger particles out before the carbon stage.
Originally Posted by MarkW19
Some water may have not gone through the sediment filter, but all definitely went through the carbon before it got to the membrane.
To be safe, I'm currently running the unit (outputting RO water) for an hour and a half to wash out any of the water that was still in it. So that when I use it properly, it'll only be "new" water that I get that's gone through the filters in the correct order etc.
I can't leave it connected because I use it in the bath
I've been doing the same thing for 7 months and the TDS are between 1 and 2 ppm. So I guess it's not a problem? I just noticed tonight that water keeps dripping out for a few minutes after it's shut off, that's all.