Eheim Professionel 4+ External Filter Treatments & Testing Emergency Nitrite and Nitrate Detoxification:

Emergency Nitrite and Nitrate Detoxification: To detoxify nitrite and nitrate in emergency situations

The biological filtration is main-tained and the service interval can be extended by a few days

Simple 2 bottle test

or Lower Level Media Baskets

Use boiled tap water to warm it to the same temperature as the aquarium for a seamless transition

Eheim Professionel 4+ External Filter Treatments & Testing Emergency Nitrite and Nitrate Detoxification:The EHEIM professionel 4+ our best external filter but now with an integrated emergency button. We have adopted the many advantages of the professional 3 series powerful performance, optimal energy efficiency, quiet operation, priming aid, safety hose adapter but we have also improved the technology by incorporating the new Xtender button. In the event the output is reduced due to the fine filter media blocking, the button can be adjusted to redirect