Li-pre-separators li etselitsoe ho fokotsa bongata ba lerole le fihlang ho vacuum cleaner ea hau, e leng se lumellang hore se sebetse ka mokhoa o phahameng ka ho fetisisa nako e telele. Ka lerōle le fokolang le koalang lihloela tsa vacuum, phallo ea moea e lula e sa thijoa, e netefatsa hore ho na le matla a matle nakong eohle ea ho hloekisa.
Ka ho fokotsa boima ba mosebetsi lihloeng tsa vacuum ea hau, li-pre-separators li lelefatsa nako ea bophelo ea vacuum cleaner ea hau. Sena se bolela mathata a fokolang a tlhokomelo le maeto a fokolang ho ea lebenkeleng bakeng sa lihloela tse ncha. Tsetela ho searola-pele kajeno 'me u natefeloe ke tharollo e tšoarellang nako e telele, e tšepahalang haholoanyane ea vacuuming.