In 2006 the Danish Engineering firm, Ultraqua installed a new water treatment system in a 25 meter indoor swimming pool at the Danish boarding school, called Bernstorffsminde. Pool water quality taken before the new water treatment system came on line confirmed the pool's water quality contained high levels of combined chlorine (state values in range ). The pool area smelled like a typical indoor pool and some of the school's competitive swimmers complained of asthma like symptoms.
Ultraqua engineers discovered by continuously removing organics, primarily human skin cells, from the pool water, combined chlorine levels were dramatically reduced. Now Healthy Pool Technologies offers this new water treatment system to North America.
Today over 35 pools and water parks employ this new technology and Ultraqua continues to improve its technologies.