There is a pure form of chlorella grown in test tubes and I would encourage you to look into it. Supposedly per my naturopath’s opinion/advice, only you should consume the purist form of it (and I guess this place in germany has the purist form)…
Chelation can be a tough thing to go through and I encourage you to carefully think it out before attempting it on your own.
My naturopath also feels that you should only chelate if your pH is neutral. Otherwise you will lose too many minerals.