Potash Alum Filtration

2019519the alum water purification process alum is a double sulphate of potash and aluminium, and in this case breaks into potassium sulphate which remains in solution, and a basic aluminic sulphatehis basic sulphate of aluminium, the composition of which is undetermined, precipitates as a more or less gelatinous and flocculent mass, and carries.