Why not chlorella?

I don't know that much about this protocol, I am planning to do some heavy metal detox, but can't at the moment because I have a mercury filling that is inside of my crown, which is something I can't remove so easily until I have more funds.
From some of my readings here I understand that chlorella is not recommended. But from my research on heavy metal detox it seems to be recommended everywhere as one of the best and safest agents to bind mercury and other metals to carry them outside the body. I've been taking some even now because from what I understand it doesn't pull metals out, it just binds whatever is in the intestines.
My question is, why isn't chlorella recommended in the Cutler's protocol? Thanks.