Dissolve part difficult to shake even after 10min. Color darkens. Accordingly, it is difficult to assess when the right time is read. Actually, you can only safely between "no more chlorine splashing around" or "Merciless differ overdosed". I manage the way! Tablets shake purely 5min (but then are still solid residue crumbs of the chlorine test tablet available) and read. I suspect that the then agrees ungefär. Excluding the tester but are now, he shows after 15min significantly to more. Then the tablet is completely dissolved allerdngs. I do not know what is really true. Better relatively inexpensive solution I have not yet found.
