Refer to the input text as context and select the correct relationship between 'water treatment' and 'water' from the available options.
Options: headquarters location, product/material produced, operator, location of formation

As opposed to operating as a systems provider, LiqTech and our partners saw an opportunity to capture increasing share of economics by working together to build out and operate large water treatment systems and work with large oil and gas producers to create long-term water supply agreements.
product/material produced