No more store bought water!!!!

[Navarchus]

Originally Posted by intarsiabox

A lot of RO/DI units suggest that you don't use the first few gallons of water produced but it should say in the manual. FYI

+1

Further more….it is highly recommended to run the first 3 stages for 30+ minutes before plugging it the membrane. The reason is to prevent all the dust and stuff to get to the membrane.
Afterwards you should let the water just to run for an hour or so, the reason is to let all the preservative lubricant stuff (in the membrane) washes out.