New pool owner with green/dark green/blue stain(?)

Little delay in my plan but the pool will be partially drained today to lower the CYA.
I was googling about stain removers and found this.
Eliminate Metals Spa | CuLator
It sounds too good to be true.
My understaning of the metal stain removal was that after AA treatment, I need to add sequester regularly to keep metals from staining the pool. But I thought I cannot physically remove the metals.
Any expert opinions on this product?
Is this another "magic potion" trying to get my money with false promise?
 
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