"lead, mercury and arsenic"

As the manufacturer of this product you're going to want to be very careful making claims like that in a public forum.

I see no evidence of CDPH certification, despite the product being sold from San Francisco:

  When a manufacturer claims that a drinking water treatment device
  will reduce contaminants [such as lead, Cryptosporidium (protozoan
  cysts), pesticides, herbicides, solvents, heavy metals, bacteria
  and viruses] or makes other health related performance claims,
  the device must be certified by CDPH, pursuant to Health & Safety
  Code Section 116830.

http://www.cdph.ca.gov/certlic/device/pages/watertreatmentde...