Can you tell me if the appliance is heating the water during the wash?
When you say that the dishes come out gritty; can you describe the grit.. size, colour, etc.
If you had said that the deposits were white I would understand that to be lime in the water, however, what you have described is alien to what I can be considered to be a possible residue left by a dishwasher so young and therefore must consider if there is contaminant coming from the installation.
Is the appliance drain fixed under the sink by any chance?
Where it is connected to the spigot, does it come up to the spigot or does it drop to the spigot from above?
Just in case that is the cause, can you higher the hose so that it drops to the spigot?
Once that is done, do a test run.
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