Another two children and two adults were treated by paramedics after the leak at Carlton Meres Holiday Park.
A spokesperson for Park Holidays said: “We are currently undertaking an internal investigation at Carlton Meres Holiday Park as to how a small quantity of excess chlorine was discharged into the park’s swimming pool whilst it was in use by holiday guests.
“The amount introduced into the water is not believed to have been sufficient to have posed any serious risk to those present.”
More to follow…