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1. Sucrose actively transported to phloem vessels decreasing water potential.2. Ions actively transported out of xylem vessel, increasing water potential.3. Water diffuses from xylem to phloem.4. Causes hydrostatic pressure so sap in phloem pushed downwards (mass flow).5. Sucrose is unloaded in the roots via active transport or diffusion.6. Ions pumped into xylem via active tranport, decreasing water potential.7. Osmosis from phloem to xylem8. Water and ions made up by cohesion tension.
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