If I add chemicals to the pond, will they affect the Nexus unit or the Kaldnes media?
The Nexus body and Kaldnes media are both made from tough long lasting polyethylene. This is totally impervious to the normal range of chemicals one would expect to encounter during treatment of pond parasites. The Answer and most of its components are made from 316-grade stainless steel, which is resistant to rust and the normal range of chemical treatments.