Here in Thailand they sell those chunks of alum at village shops. Called สารส้ม in Thai. Villagers follow the same routine, swish it around in a bucket of dirt

Here in Thailand they sell those chunks of alum at village shops. Called สารส้ม in Thai. Villagers follow the same routine, swish it around in a bucket of dirty water to settle it out. Photo on the page at this link: https://pantip.com/topic/38053321 https://pantip.com/topic/38053321