Bigfoot,
I've been using Milton as my water steralisation method since about 1982, based on the principle that if it's safe enough for steralising baby feed bottles it's safe enough for us adults.
All you need to do is follow the instructions re how much Milton per litre of water.
The way I do it is, rinse the aquaroll out with clean water, then fill it half full, put in the required amount of Milton (obvoiusly depends on the capacity of your water container) then fill the aquaroll up to the brim, this ensures that the Milton is thoroughly mixed.
I then connect up & run the mix through all the pipes by letting it run through each tap location in turn, using both the hot & cold, but not together, this ensures it runs through both the hot & cold systems, keep running it through untill the aquaroll empties, when it does, rinse out the aquaroll a couple of times with fresh water, whilst doing this let the Milton mix sit in the pipework for about 15 - 20 mins, finally run a couple of aquarolls full of fresh water through the system by using each tap location in turn, to flush out the remaining Milton mixture.
This I've done on the last 5 vans;
Van 1. 82 - 90 = 8yrs (foot pump, then converted to electric pump)
Van 2. 90 - 94 = 4yrs
Van 3. 94 - 2000 = 6yrs
Van 4. 2000 - 2006 = 6yrs
Van 5. 2006 - present = 1.5yrs
Yes I've gone through a few pumps during that time, but have never had a failure of a water heater unit, nor to my knowledge has the Milton eaten through or disolved any metal part of the water systems, and we have never had any tummy upsets through drinking or cooking with the water from the pipework (both UK & continental).