Your old he mushroom can corrode over time, depending on the mineral content of the water used.
Most handy solution is to replace the part with this one, that should get the flow rates and water pour at normal rates (OEM ones).
E61 group head mushroom for Vibiemme machines is made from chrome plated brass.
Fits Vibiemme Chimaera, Vibiemme Cubo, Vibiemme Domobar, Vibiemme Dosaplus,Vibiemme Mercury, Vibiemme Replicia, Vibiemme Revolution.
Will not fit models like Rocket, ECM, Isomac, BFC, Bezzera and so on.
BEFORE INSTALLATION make sure the machine is unplugged from power socket, is cold and ready to work with !
– Remove the Hexagnal big chrome nut on top of the group;
– Remove existing brass gicleur (small brass screw found inside the mushroom, under the nut you just removed), along with the filter and old viton white o ring. Clean the gicleur and filter because these two are usually clogged.
– Remove old mushroom and reinsert bras gicleur and filter into this new mushroom;
– Add the Teflon o-ring;
– Replace mushroom.