Milton's advertising* tries to make out that it's somehow different in kind to other disinfecting agents. This is not so. The active ingredient in it is sodium hypochlorite -- the same as in Domestos or any other household bleach.
It's at a low concentration, somewhere about 2% by volume in the sterilising solution, but a similar concentration of ordinary bleach would have the same disinfecting effect.
*The Milton Web site is there mainly to sell product. Here is some impartial information about bleaches --
Safety (MSDS) data for sodium hypochlorite solution .
Hope that helps,
Roger