What is the relationship between 'water treatment' and 'water' in the context of the input sentence.
Options: parent organization, chairperson, owned by, product/material produced

We project revenue will decline by 7% to 8% in 2020 as strong organic North America water treatment sales and resilient North America residential water heater volumes are more than offset by weaker North America commercial water heater and boiler volumes and lower China sales, largely due to the pandemic.
product/material produced