I have horrible tap water, Hard and can smell the chorline. I used it just fine to germ.
Layer a paper towel, I fold mine into a little square so it's a little thicker, get it wet, squeeze it slightly so when you let off pressure it no longer drips.
Do the same thing with another and simply lay it on top of the other with the seeds in between. Push down slightly so they are touch the towels. Warm dark place should have taps in 48 to 72 hrs
That's how I do it and have never had a problem