Hi Wes,
It is not worth the trouble of trying to reuse the brine shrimp water, unless you want to set up a large tank of live rock, and even that solution would still need help, with top ups and so on. And unless you are into marine ecosytems that would not be even close to practical.
When the nauplii hatch they release organics into the water, things like enzymes and membranes and so on. That is why the culture will sooner or later go cloudy, bacteria love the nice warm organic soup. So in the end there are not any realistic alternatives than to start over each time.
With all live food cultures there will always be some waste. The soil for grindal worms will need to be replaced for the reasons you say. Recycling it is not really worth the trouble unless you really have a shortage of soil to use. Not having a garden anymore i can understand that problem though. If you are really keen to do something with it, i would suggest using it to grow herbs on your kitchen window or something. Plants would love it, although you would have to mix it in with old soil first.
Hope that helps,
Scott.
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