Foam

1. Control white water pH to correct level.
2. Increase defoamer and check operation of headbox showers (avoid excessive addition of defoamer).
— most defoamers are surface active agents that can generate their own stable foam.
3. For foam in wire pit, increase defoamer addition.
— if situation is not improved, dump white water system, flush and fill with fresh water.
4. Reduce internal size in sheet.
5. Ensure getting properly washed slush pulp.
6. Check operation of air evacuation system.
See Foam control.