Ann: Appendix 4C Quarterly (Q4 2022) and Business Update, page-122

The Phosflow registered to Cytec (owned by Solvay) is "PHOSFLOW® is an additive that inhibits scale formation on heat exchangers and process piping in phosphoric acid production plants." You can find it on the Solvay site.
https://www.solvay.com/en/search?s=phosflow&f%5B0%5D=fsection%3AProducts.

The Phosflow that PET has listed is clearly a different product, but with the same name. Certainly confusing, but they are unrelated products.

Phosflow™ Environmentally safe solution for flowing water remediation Phosflow™, developed with the U.S. EPA under a Cooperative Research and Development Agreement (CRADA), adsorbs phosphorus from water upon contact. Phosflow pellets are made from naturally occurring and sustainable mineral materials. It is non-hazardous, insoluble in water and non-toxic to aquatic plants and wildlife.

tm means trademark and r means registered