It will melt vals and anarchis yes.
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They are the same thing. If you dilute metricide 50:50 with water, you've made excel.
So if you use Excel already, it will make no difference.
It is crazy cheaper. I buy EVERYTHING on Amazon, but that is not the cheapest place to get it. I don't remember where I did get it I just googled and picked a shop. Scientific supply shops it is dirt cheap even when factoring in shipping.
Metricide is valuable enough in itself (in value and as a carbon source) that I'd just chuck the anacharis and vals and replace them with similar looking plants that thrive with the extra glut.