I don't know much about chelation since I learned about it only a few months ago because I was trying to eliminate calcium carbonate from my brain after a fracture (it caused me language problems). A health store naturopath suggested I try a product called "Heavy Metal Cleanse" by Renew Life. They have two pills a day, one in the morning with vitamins and minerals (because chelating and especially algin eliminates the ones you have in your body) and one in the evening with chlorella, cilantro and algin. The product had no apparent effects on me, either good or bad. If you click on "View Labels", you can see the ingredients:
I was not able to find algin alone in health stores and in one of them, someone suggested I take activated carbon that does the same thing. I am also trying a product with humic fulvic acid and minerals (Master Detox) and am taking a lot of vitamins. It seems to be working and to have reduced some of my language problems. I have only been taking it for 3 weeks.