Assertion: copper sulfate | /r/ObjectUse | used for algae control
Facets:
value: many years ago
type: TEMPORAL
Source sentences:
text: Copper sulfate was used many years ago for algae control however there was adverse environmental effects of copper build-up in the bottom sediments when this product was used.
text: Copper sulfate was used many years ago for algae control however there was adverse environmental effects of copper build-up in the bottom sediments when this product was used.