Refer to the input text as context and select the correct relationship between 'water treatment' and 'water' from the available options.
Options: platform, stock exchange, employer, product/material produced

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