Pastes and high viscosity products pose a challenge as they do not flow easily , preventing the pump from priming properly and causing cavitation , which results in pumping air instead of the product .
The solution is to use a Kecol Maxiprime twin cylinder pressure priming system in conjunction with a Kecol stubby pump , maintaining a positive prime on the pump and thus ensuring that it does not cavitate . As the product level falls , the sides of the drum are wiped clean by the follower plate on the priming system .