1/I'm suspicious of 'clustered' water. What little research I've done indicates it only exists on the surface of briskly moving water, or manipulated by magnetic forces: Pour it into a bottle, it ceases to be clustered. 2/Keep in mind that IONIC silver is best for nebulization. While colloidal silver may be as high as 90% particles/10% ions,(I assume the 3600ppm is indeed colloidal), ionic is often 90% ionic /10% particles. Considering the innumerable # of ions that 'fit' the '%-space' of one particle, ionic silver really doesn't operate by the 'ppm' rules. As horrible as morgellon's is, the major issue for the population now is keeping the lungs, throat, & nose clear of bacteria, fungus & viruses; best handled by nebulizing ionic silver-water as a daily ritual, while non-symptomatic. I can't imagine any healer finding the need for a higher ppm under these circumstances, but to whatever extent they -do-, higher dosage has the same effect as higher ppm, & boiling it down for a little while could conceiveably get it even stronger than 3600ppm, if & when that's an issue. Thus I conclude that while there's certainly no reason -not- to get the "stronger" product, for those who already are making their own ionic silver, there's no need to purchase additional products.

Why can't you just use a little spray bottle instead of a nebulizer?

You can breath a micronized mist deeply into your lungs with a nebulizer. This is the most efficient method, & by the time you have respiratory symptoms, it's necessary. A spray is ok to hit the back of the throat as a precaution to keep bacterial/viral/fungal loads down to manageable levels as a part of everyday hygiene, or when your only symptom is a sore throat. If a respiratory issue has already begun, but is not yet symptomatic, spray won't be enough to stop the disease's progression. There's no down-side to nebulization, so 'better safe than sorry' applies.