Take context from the input text and decide on the accurate relationship between 'water treatment' and 'water' from the options provided.
Options: employer, platform, product/material produced, stock exchange

The joint venture is currently in negotiations on multiple projects, whereby large water treatment systems would be built based on LiqTech's proprietary silicon carbide technology and operated by the joint venture on the long-term water supply agreements with oil and gas producers.
product/material produced