If the pool service technician installed quality materials, used proper methods of installation and maintained the correct chemical levels, then the pool surface should last for at least the following:
Company profit: It's a better option to hire a plasterer direct than to contact a company. This will save you money, as it won't cost the company any share.
If you use chemical treatments or a sandblaster, you’ll have to clean the pool again. Dispose of the stripped materials using a wet/dry vacuum.