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The timber is loaded into a treatment vessel. Initial vacuum applied and the timber cells are evacuated of air. Vacuum held.
Cylinder flooded under vacuum with TANALITH wood preservative.
Hydraulic pressure applied, forcing the preservative deep into the structure of the timber.
Final vacuum extracts excess preservative solution, which is pumped back to storage.
Low pressure inside timber draws in surface solution when vented to atmosphere. Treated timber is left to dry.