The following is about Aluminum Sulphate,i hope to help you better understand it.
XT-5000 is a superior scale inhibitor and dispersant. It has good inhibition for silica and magnesium silicate when used in recirculation cooling circuits and boilers. It is a superior phosphate scale inhibitor for dry or hydrated ferric oxide
XT-3100 is a good scale inhibitor and dispersant for cool water treatment, it has good inhibition for dry or hydrated ferric oxide. XT-3100 is a all organic dispersant and scale inhibitor,XT - 3100 has good inhibition for dry iron oxide and hydrated ferric oxide.