RO/DI question?

[DanG]

It's a known issue but for the life of me I can't remember the term for it.

I don't have an auto top off device, but when I make water for my 5g top off bucket, I hook the system up, let it run for 10-15 minutes, dump that water and then keep the stuff after that.

[mark]

I've seen it posted before that there's a TDS rise (TDS creep) with ro/di and auto-topoff.

I've got a float valve hooked to my Aquasafe unit and have tested many times the first couple of ounces (just enough so my meter reads) but never seen it.