“…In order to reduce the toxicity of concrete, the cubes were placed in the lake (natural reservoir, about 1500 ha), in the coastal and wave zone, 5 m from the shore, at a depth of 1 m, for 9 months (from September 2016 to June 2017) (Mariak et al, 2018;Wojtasik et al, 2019). After the exposition period, BP cubes were stained with the Rose Bengal sodium salt (Sigma-Aldrich Merck) to determine the spreading of samples by small aquatic organisms and microorganisms.…”