What does chloride to sulphate ratio mean?

[SKBugs]

I’m in Brisbane and want to try a NEIPA and it seems I have to be very specific about the above ratio. No idea what it means and how to get it etc?
Podcasts I listen to (Brülosophy etc) all insist about the importance of it.
Does it matter?
If so, how do work it out etc? The books confuse me
Cheers

 

[Jack of all biers]

https://www.brunwater.com/water-knowledge

Section 4.4 in the above link explains it and is fairly easy to follow.

 

[SKBugs]

That’s awesome thanks. Also funny coz I’d heard them talk about this site but with the accent I couldn’t work out how to spell it.
Cheers