Chikwama chosefera fumbi ndi mtundu wa zinthu zosefera -zochita bwino kwambiri zokhala ndi mpweya wabwino, zochotsa fumbi, komanso asidi ena, alkali ndi kutentha. Multi-maburashi am'mbali amagwiritsidwa ntchito poluka kuti nsaluyo ikhale yolimba, yomwe imakhala yotanuka komanso yochotsa fumbi labwino kwambiri. Mlingo wochotsa fumbi ukhoza kufika 99.999%. Matumba osefera fumbi amapangidwa ndi poliyesitala kapena ulusi wautali. Moyo wautumiki nthawi zambiri umakhala nthawi 4-6 kuposa wa nsalu zamagalasi. Iwo ali ndi mpweya permeability wabwino, mkulu fumbi kusonkhanitsa mlingo, zosavuta kuyeretsa, ndi fumbi kuchotsa dzuwa akhoza kufika 98.99%.