OK after a little research. They are Muntons Carb Drops. And the lable says
"Muntons Carbonation Drops 250 TABS are made of a special blend of Dextrose, spray dried extract and heading powder. Place 4 tabs per 120z bottle for a normal - high carbonation level. Muntons Carbonation Drops amount can be varied to gain different levels of carbonation. We do not suggest going over 5 per 12 oz bottle, but hey it's your mess, try six if your adventurous."
So should be safe with 4. But I also read that the carb drops will leave white flakes in your beer, Apfelwein in this case. Yuck! Hope that don't happen.
"Muntons Carbonation Drops 250 TABS are made of a special blend of Dextrose, spray dried extract and heading powder. Place 4 tabs per 120z bottle for a normal - high carbonation level. Muntons Carbonation Drops amount can be varied to gain different levels of carbonation. We do not suggest going over 5 per 12 oz bottle, but hey it's your mess, try six if your adventurous."
So should be safe with 4. But I also read that the carb drops will leave white flakes in your beer, Apfelwein in this case. Yuck! Hope that don't happen.