When we use our washing machine, bubbles come up throught the floor drain, no matter how little washing agent is used. Are there any cheap altenatives to assist in this problem?
The water from the washing machine should not be drained via the floor waste gully, the line should be connected directly to the drainage line that bypasses the floorwaste or to a gully external of the building.
Sounds like your drain is partly stopped up, have the line cabled. When the washer is discharged there is to much water comming out and the drain is partly stopped and it backs up.