PH adjustment - Media fill

Validation
1

Dear All,

As per the PICS and PDA guideline it is recommended to adjust pH of the final bulk media if required i.e. 7.3±0.2,
What are the material used to adjust pH of media??

Thanks

2

Dear All,
Anyfeedback, if NaOH or HCL can be added? or is there any impact and any other ingredients required??

Thanks