unpolluted

"The filtration of the pool water removes leaves and dirt, making it clean for swimming. "

"She used a water filter to purify the river water before drinking it. "

"My grandfather enjoys fishing in the lake every weekend. "

"She offered to help with her homework."

"The factory polluted the river when it cleaned its tanks."

"They completed the first series perfectly."

"Factory chimneys released pollutants into the air, making it difficult to breathe. "

"The removal of the old furniture was a big project for the family. "

"My favorite weekend activity is swimming. "

"We spent the weekend hiking in the mountains."

"The bottled water was guaranteed to be uncontaminated and safe to drink. "

"The straight path to the school led past the park. "