250g Bag Aluminium Sulphate. *. 17% Iron Free Alum Al2(SO4)3 by Amazon.co.uk

• Aluminium Sulphate in Powder Form

• Iron Free - suitable for use as a dye, mordant, water purifier and jar sterilizer

• Can reduce soil PH to can Hydrangea's colour

• It can be very effective as a molluscicide, Killing Spanish slugs.

• Sometimes called Alum or Papermakers Alum.