Some industries require to have the fill volume very accurately.
Pharmaceuticals, cannabis oils and expensive products, for example, cannot afford to have more or less product. This is why a piston filler will be, in these cases, the equipment to offer.
On the other hand, for the cosmetics industries and the beverage industry which use transparent containers which can have certain variations of the thickness of the container, the key factor of quality will be the visual level of filling in order to look good on the display. This is why a level or "overflow" filler will be a preferred choice.
The piston filler
The high vacuum filler
The level filler
The gravity filler with pressurized tank or not
The pump filler
Household product industry
Pharmaceutical, PSN and Cannabis