The negotiator for OREA is a 3D printed tool for OREA fast flow paper filters. You can buy this one or you can print one yourself: https://www.thingiverse.com/thing:5196976
When you fold the filter twice to create a cross in the circle, then you unfold it and put it on top of the brewer. Then you press with the negotiator to get the filter inside the brewer. It will stick on the walls. After gently putting the negotiator out, you can rinse the filter with hot water. The filter is designed for faster flow and lower bypass as it sticks on the walls of the brewer.