The pads do work, but in order to remove the mercury, the body needs to detoxify the less heavy metals first i.e. arsenic, aluminum, etc.
Someone with a high level of these lighter metals will take longer to get to the heavier metals.
You can increase the "reach of the pads" by using "dentox" a homeopathic remedy and soaking your feet in warm water with Epsom Salts .
You may also want to get a hair analysis test, if you have not already done so, to have a baseline to monitor your progress.