First responders were on the scene for two hours at the newly opened Webber Pool in North Minneapolis Saturday afternoon, called for a possible drowning. But the search ended up being a "false alarm."

Authorities were called after a lifeguard claimed he saw two children jump off a platform into the water but saw only one surface, the Star Tribune reports.

Minneapolis Fire Department and the Hennepin County Sheriff's Office responded to the scene, KSTP reports.

The pool opened on Friday and is touted as the first public naturally filtered pool in the country. Rather than using chemicals such as chlorine to filter the water, the pool has a natural filtration system that uses plants from a nearby pond, as well as limestone and granite. For that reason, the water is somewhat murky, not clear like water in a chlorinated pool.

The pool was slated to open in 2014 but was delayed by construction issues and red tape.

KSTP reports there are still some bumps; the vacuums purchased for cleaning it are not working properly, meaning employees spend up to 16 hours-a-day cleaning it manually.

Webber Pool is open from 1 - 7 p.m. Fridays, Saturdays and Sundays through Labor Day weekend, including Monday, Sept. 7.