RO/DI help


New member
Ok well i dont know if this is the right form but how long can RO/DI water stay in the unit with out become stagnent. I have had water in my ro/di unit for at least two weeks and today i am running it can i use the water that just came out or should i wait and let so water just go in the drain. how much water should i throw away and how long can water last without being used in an Ro/Di unit. thansk for anyhelp and please answer.


Active member
two weeks is fine,
after all, they are sealed units, it's not like any airborn dirt is going to get into it and spoil the water.

you could probably go even longer without use, if i happen to go more than a month without use(very rare) i just let it run for 5 minutes then use the water after that.