I have applied a method seen on youtube where the keg was laid down and rocked by foot rolling it back and forth for about 5 minutes. Trouble is I did not get much bubbles after about letting it settle for 1.5 hours. I used this graph
carb PSI was 26 for 60F temperature currently in my cellar
after the rocking lowered the PSI to about 7 for serving and let it settle
What else can I try to get it carbonated ? This is a commercial 50 liter keg.