protected override void OnStart(string[] args)
{
    // Expose remote object
    remotePool = new RemotePool();
    host = new ServiceHost(remotePool);
    host.Open();
}

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, AutomaticSessionShutdown = false)]
public class RemotePool : IRemotePool, IDisposable
{
    //...
}

public string SomeFunction()
{
     return WrapFunction(() => someFunctionThatMightThrowAnException());
}

private T WrapFunction<T>(Func<T> func)
{
    try
    {
        return func();
    }
    catch (Exception e)
    {
        throw new MyRemoteException(string.Join("n", UnwrapException(e)));
    }
}

public class MyRemoteException : FaultException<MyServiceFault>
{
    //...
}