Originally posted by coquette
the mechanical forces of shaking the container would be very important in helping to remove contaminants.
without attempting mathematical modeling, my intuitive guess (presuming a contaminant that is reasonably water soluble - all bets are off for insoluble greases, for instance) is that you could add very little water at first - maybe 1/10th of the volu aint - do it until you think you are way past the point where you thought you needed to.
I get down and dirty, so to speak, with contaminants. One of my jobs was maintaining a DI water treatment facility in our cleanroom. Talk about 99%. That would ruin every process that depended on the DI water to clean, such as flushing sulphuric acid from acid baths, the high pressure jet wafer cleaners that used DI water and such. We have sophisticated contamination measurement instrumentation and 5 or so stages of contaminant removal starting with city water. One of which is an electronic ionization exchange that electrically ionized the contaminants in the water then using strong magnetic fields to divert the suckers. We also have to deal with algae growth which for some reason loves DI water, a system of about 8 high powered UV lamps with the water going by that kills most of the bacteria and algae. The weird thing about that was, the particulate counter would show low parts per million but at some of the flow meters (transparent slightly cone shaped tubes with a plumb bob looking thing that would measure the flow by how high it floats in the tube), that instrument STILL had a small amount of algae build up. After all that work to make DI water, some stuff still lived!
I know from experience if the contaminant is insoluble in water, it is a heck of a lot easier to remove by mechanical shaking. The really bad stuff is soluble. We have a water cooling loop that we had to remove all the iron fittings and replace with plastic because we would have devices that was water cooled and unless you take extreme pains you can't use DI water for cooling unless forced by, for instance, high voltage barriers (DI water is a good insulator, we cooled an ion implanter with it, which has 200,000 volt power supplies but it is a pain in the butt to use because there can be no metal at all in the DI water path, DI water eats out SS like acid)
so the cooling loop had some iron piping and it contaminated a molecular sieve vacuum pump ( a very high tech machine) and I had to add a lot of filtering units to keep the crud out of the pump). Contamination was one of my biggest bugaboos in our cleanroom. I guess any cleanroom, and I have seen hundreds of them.