A vaccum pump of capacity of 100 liters per minutes or 1.5 CFM is
required for investing table which is small.
If you are buying a new one go for 100 liters per minutes minimum
and not 60 liters per minutes because the price differece is not
I have a double rotaty vane vaccum pump of 300 liters per minutes
capacity, I have a vaccum tank of 12 inches diameter by nine inches
The higher the capacity the faster the air removal and total air
removal from the investment slurry.
Hope this will help.
Best of Luck
May God bless us all with total health (Mental, Physical, spiritual
Strive to be Happy