If you evaporate your perc-contaminated wastewater, you must first treat it by physical separation (water separator) and double carbon filtration.
(you; evaporate; your perc-contaminated wastewater) (you; must treat; it; by physical separation (water separator) and double carbon filtration; T:first)
you you
evaporate must treat
your perc-contaminated wastewater
it by physical separation (water separator) and double carbon filtration T:first