Noobish coolant question

Hi,
When the manual calls up 50 / 50 mix of coolant.
what happens when you use a concentrate coolant that requires you to do the mixing?
i.e. my coolant (1 litre) of concentrate makes 15 litres of coolant.
Once mixed it is ready to use.
Can i then just use it or do i then need to dilute again to get 50 / 50 ? ?
thanks
When the manual calls up 50 / 50 mix of coolant.
what happens when you use a concentrate coolant that requires you to do the mixing?
i.e. my coolant (1 litre) of concentrate makes 15 litres of coolant.
Once mixed it is ready to use.
Can i then just use it or do i then need to dilute again to get 50 / 50 ? ?
thanks