You really need to stop using the super shock, which is contributing to the high hardness, and start using bleach instead. With hardness that high, once you get the conversion finished, you're still probably going to have problems with scaling and milky water. And heunix is right--draining and refilling is going to be necessary to lower the hardness. Depending on how expensive water is in your area, I would strongly consider doing the partial drain/refill thing NOW, which will also help lower the bleach requirements during your conversion process.

janet