RO/DI system ?

[OUCH!]

When your done using it, do you leave the water in or open it up and empty each chamber out?

[ramsey]

I leave the water in. If it's going to be long term, you might want to empty the water out but you need to keep the RO membrane wet or it will go bad.

[OUCH!]

Ok

so how long is to long?

[BuckeyeHydro]

You should run your RODI system at least once a week. Membrane manufacturers recommend that you pull the RO membrane and store it in a preservative for periods longer than that. We work with the preservative all the time here, but this is probably something you don't want to mess with. Just set up your water production routine so you run it at least once a week (and of course on the other end of the spectrum, make sure you don't short cycle the system either).

Russ

[Mr Cob]

You should run your RODI system at least once a week. Membrane manufacturers recommend that you pull the RO membrane and store it in a preservative for periods longer than that. We work with the preservative all the time here, but this is probably something you don't want to mess with. Just set up your water production routine so you run it at least once a week (and of course on the other end of the spectrum, make sure you don't short cycle the system either).

Russ

Hi Russ, can you explain what you mean by "short cycle the system". Thanks, always appreciate all of the info.

[BuckeyeHydro]

Each time an RO system kicks on, it produces a pulse of not-so-clean water due to a phenomenon called “TDS Creep.” Product water TDS typically declines to desired levels after approximately 60-90 seconds. If you short cycle your system - meaning if you set it up so that it kicks on/off frequently for short periods of time, a large percentage of the water you'll get is TDS creep water. Here's some data from two test runs with a 75 gpd Filmtec membrane treating 260 ppm feedwater.

http://i224.photobucket.com/albums/dd293/BuckeyeFS/Graphs/TDSCreepl.jpg (http://s224.photobucket.com/user/BuckeyeFS/media/Graphs/TDSCreepl.jpg.html)

Russ

[Mr Cob]

awesome, thx for laying it out