ErFra VoorKiemSystem (VKS) yolemba Erik Juurlink ndi Frank Houtink idayambitsidwa pamsika ngati zatsopano chaka chatha. Ichi ndi choyikapo chamatabwa chopindika chokhala ndi lamba wokwanira mubokosi losungirako mbatata. Ndi dongosolo la kumera lisanamere, pafupifupi 1000 makilogalamu a mbatata atha kuikidwa m'bokosi.
Dongosololi limatsimikizira kumera kofanana kwa mbatata ndikuletsa condensation mkati mwa bokosi. ErFra VKS ili ndi mtundu wa "chimney effect", yomwe imaonetsetsa kuti mbeu za mbatata m'mabokosi zimatenthedwa mofanana.
ErFra VKS pre-meremination system ndi yabwino pamabokosi anu amatabwa (160 x 120 x 109 cm). Mukadzaza bokosilo, njira yoberekera imatha kuphimbidwa ndi chivindikiro. ErFra VKS pre-meremination system ndi yopindika kuti isungidwe mosavuta.