How do paramecia regulate there water content?

Paramecia regulate their water by using contractile vacuoles (if you need to know what contractile vacuoles are feel free to ask)

Paramecia regulate their water content by using contractile vacuoles, special vacuoles that collect and actively pump water out of their cytoplasm. They are especially necessary in the freshwater environments where paramecia are primarily found, as in these environments they are constantly taking in water via osmosis. They also possess special salt crystals that dissolve or solidify as needed to maintain the solute balance within the cell.