Alum (Aluminum Sulfate) is useful
● Clumping impurities in the water purification process
● Alum is often used as a purifier of turbid water
For more details on silicates see https://id.wikipedia.org/wiki/Tawas .
Alum available
● Alum Bump (crystal alum)
● Alum Powder .( alum powder )
Please contact us ( WA no in the product photo ) .