The students at Allenstown elementary school watch as Dan Chagnon of the Allenstown wastewater treatment facility uses a powerful magnet to lift the grate on the water drain in front of the school on Friday, April 20, 2018.
The students at Allenstown elementary school watch as Dan Chagnon of the Allenstown wastewater treatment facility uses a powerful magnet to lift the grate on the water drain in front of the school on Friday, April 20, 2018. Credit: GEOFF FORESTER—Monitor staff

Allenstown Elementary School hosted a day of educational events Friday ahead of Earth Day.
Local vendors, including the Allenstown wastewater treatment facility, came in to teach kids about pollution and the water cycle. Kids at one point gathered outside and peeped down a storm drain as representatives from the treatment plant explained how water flows through the town and how pollutants can end up in water ways like the Merrimack River. Earth Day has been celebrated on April 22 since 1970.