R/O Water Storage Question

[mike31154]

I use a rectangular rubbermaid type container to store & mix my fresh water, about 25 gals I think it holds. I just rinse it a little and let air dry between use. Have never checked the TDS of the RODI in there since I generally make it up a few days before water change and mix in the salt fairly quickly after production. There's quite a bit of calcium/mineral build up on the inside of the container after a few years of use, so I'm sure the TDS rises as soon as the RODI water hits it. I certainly wouldn't sweat a slight rise in TDS and definitely wouldn't discard it because of that. I used treated tap water for the first couple years of running my system, so a bit of TDS after RODI production is not going to get me too wound up. Do you have lids for your pails? That might keep the TDS down closer to 0 for you.