Watch the water.
https://www.brita.com/why-brita/what-we-filter/
1,2,4-Trichlorobenzene
(Compound)
https://pubchem.ncbi.nlm.nih.gov/compound/1_2_4-trichlorobenzene#section=NIOSH-Toxicity-Data
trihalomethanes
http://www.nesc.wvu.edu/ndwc/articles/QandA/OTsp99_Q_A.pdf
Atrazine
https://en.wikipedia.org/wiki/Atrazine
Lindane
https://en.wikipedia.org/wiki/Lindane
Trichloroethylene (TCE)
https://en.wikipedia.org/wiki/Trichloroethylene