You are right - there website makes it look like they know what they are talking about. But here is the rub - there are any number of websites out there who quote studies and so-called experts and publish information proclaiming that their silver product is somehow uniquely produced and thus superior to all others. I find their contention that even a 9 volt battery of 500 milliamps is 499 milliamps too many to be rediculous - and it flies in the face of how virtually all other silver products are made, including ones that have been proven to stop the flu in its tracks (such as Utopia Silver) as well as knock out staph (including MRSA). When it comes to silver, two of the biggest keys are particle size and surface area. The smaller the particle, the greater the surface area for any given PPM of silver (and anything over 20 PPM really is overkill. The two manufacturers whose true colloidal silver products are superior to all others I am aware of are CureZone sponsor Utopia Silver and Mesosilver by Purest Colloids, both of which have had particles measured to be as small as 0.65 nanometers.
I note that when Pravda recently reported that colloidal silver will stop the Swine Flu, they listed Utopia Silver as their source of colloidal silver, and the veracity of what they wrote was later verified by a testimonial sent in which stated that a family in New York beat confirmed cases of Swine Flu in just a few days with the Utopia Silver product. I am also confident that the fine Mesosilver product will knock out the flu in short order as well.
There are others which will also likely actually work, both commercial products and the mostly ionic silver you make at home with either the Utopia Silver Silver Bullet, the Silver Puppy, or the SilverGen generators (you will have to take quite a bit more to do the same job the Utopia Silver and Mesosilver products will do), From what you describe, the product you have does not work - at least not at the amount you are taking.