Pat,
I'm a little confused. You mention 'beads', but the Odorlos website shows only a bottle of liquid with a pre-measureing cup built in. According to them, it contains nitrates, magnesium and potassium - nutrients for the bacteria to feed from, but doesn't say what the exact chemicalsl are, so it's difficult to say what could be causing the residue. The specified dose is 4oz. mixed with one gallon of water for 40 gallons of grey/black water. A couple things come to mind: Are you using more than the recommended concentration? Do you dump when nearly empty? This could cause an overly high concentration over time. Do you dump chemicals other than biodegradable soaps, etc? If so, this could cause the ingredients in the Odorlos to percipitate out and that's what you may be seeing. Do you fill with very hard water that contains high amounts of calcium? This too will percipitate out and form a choking coating on the piping. There are simple test kits available to check for this. Or more simply, fill a small pan with water and put it on the stove to boil away. If you see a white residue in the pan, you have a high concentration of suspended calcium or other contaminants. If that's your problem, you may need to install a small water softener for washing and cooking and a bypassed supply of un-softened water for drinking - if that is your choice. I don't have a problem with drinking softened water, but some people (especially those on sodium restricted diets) may choose otherwise. Your other choice would be bottled water for drinking. Hope this gives you some helpful clues.