... Before the experiments, the algae were growing throughout the day. ... Thus, it was concluded that the effects of the toxicants on F and K were related not only to inhibition of the algae cells filtering Maximum concentrations of the examined substances that did not affect the filtering rate of daphnia in the one day experiments Toxicant Mercury Copper Led Potassium bichromate Zinc TPTC Concentration , OEL for fish µg/l industry waters 0.3 5 10 40 10 2­3 0.1 1 100 ­ 10 1 Based on the ...