Only QLA manufactures Pure Quality filters which are guaranteed Chromium and Heavy Metal free.

Filters for most sampling methods are available in numerous micron ratings and three main types: Cannula Filters, Filter Discs, and Filter Tips. The PureQuality certification program guarantees filters not to have any Chromium, heavy metals, material contaminants, or inorganic elemental interference. In addition, they have been formulated to provide the specified micron rating and verified by Porisometer Testing. All filters are USP compliant where applicable, and meet machine manufacturer specifications.