L.S.
We have the same problem where we live. Many in the neighborhood refuse to drink the water because of it, but we cannot afford that. Our fridge has a water filter built in and even that doesn't help. When the water dries in the try it leaves a nasty white crusty film that does not wash off. I am a realtor and I spoke to some different folks about this. I also had my water tested to make sure these were not contaminates, and they are not. Good. Everyone agreed that aside from a really good quality water filtration for the whole house, there is little you can do. Yes, they can be expensive, but what you will need is not just a filtration system, but a water softener. The only way we'll be able to get one is to save the money. It will take a year, but it is truly worth it and could help the value of the house should we sell later (when the market is better). Do some research on the different ones out there and see if they have a payment plan. Or, just save. They really are worth it and everyone I know loves there's. It's better to pay for that, then to have to get a new dishwasher every few years or waste water consistently trying to fix the problem yourself. Good luck!