What do cantractile vacuoles allow paramecium to get rid of?

Contractile vacuoles in Paramecium help expel excess water that accumulates within the cell due to osmosis. Since Paramecium live in freshwater environments where the water concentration outside the cell is higher, water constantly enters the cell. The contractile vacuoles collect this excess water and, upon contraction, expel it outside the cell, maintaining osmotic balance and preventing cell lysis.