A minimal flow of S Slag falling into a kress Pot. A kress pot holds approximately 674 cubic feet of material. At the rate of flow shown here it would take several hours to fill a kress pot. Under normal circumstances the slag flow will fill a pot in about 25 minutes and at maximum flow the kress pot can fill up in as little as 15 minutes. When full the pot will be swapped out with an empty pot and transported to the cooling area. After the pot has cooled for 96 hours the hardened slag will be re-processed to recover the 2% remaining copper content.