Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

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.

Answer: product_or_material_produced: water treatment, water