Many thanks for the replies!
The theory(?) goes something like this, that creatine is (partially) destroyed in the stomac acids (and/or converted into creatinine, which is then excreted via the urine[?]), and that by elevating the pH level with bicarb, less creatine is needed, resp. more will be absorbed.
The same principle may be applied with Kre-Alkalyn, where less is recommended - not even a "loading phase".
Actually bicarb is also supposed to prevent sore muscles - apparently I'm not taking enough.
(http://www.flammerouge.je/content/3_fac ... bicarb.htm
"... muscle contraction is impaired and the low pH stimulates the free nerve endings in the muscle resulting in the perception of burning pain...
... Sodium Bicarbonate supplementation allows the acid produced within the muscle cells to be processed when it enters the bloodstream, thus more quickly reducing the level of acidity within the muscle cells themselves
I am drinking about 0,7 l with the creatine, and more than 3,5 l per (on the whole-) day.