Trade mark number: 
At the time of filing, this trade mark was owned by the Water Quality Association (WQA). WQA is a not-for-profit international trade association representing the residential, commercial and industrial water treatment industry.
The WQA’s certification program is dedicated to providing public health and safety services throughout the USA and globally. The Gold Seal Program offers certification of all products and chemicals that contact drinking water.
Certification rules: 
1436026.pdf PDF in PDF format [5.46 MB]