Really need distilled water?

Edtog said:

Take a trip to Halfords and get their distilled water, £3.79 for 5l.
I use it for developer and final rinse in my b/w and c-41 just to be sure.

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I think Halfords call it Battery Water

I use it for a my final rinse with sheet film - dries with almost not residue

As for the OP - yes I would use Halfords Battery Water for this application.

Standard developers are buffered to work equally with the wide variety of water types available world wide.

Specialist developers like this one are probably are not buffered - hence the note for Distilled Water

Martin