Conflicting Jobo 2550/2551/2553 volume

[Fatih Ayoglu]

Hi all,

So I have 2x 2550 tanks using with CPP3. When I enter the tank model into CPP3, it asks you to use 640ml chemistry, whether it is half or full loaded. One of the tanks confirm that, it says 640ml with 3 or 6x 120 rolls. However the other tank says if I use 6x 120 rolls I should use 750ml chemistry. (The tanks are the exact same tank, take 3 reels each of them can accommodate 2 rolls). The first tank doesn’t mention that, neither the CPP3 itself.

(Jobo USA documents say 640ml as well)

How much chemistry do you use?

 

[MattKing]

I don't use JOBO, but when I see conflicting instructions, I usually choose the version with the greatest safety factor.
Therefore, personally, I would use 750 ml.
The extra 110 ml isn't particularly expensive.
When you load two rolls on the reels, that first roll ends up relatively close to the centre, and therefore a relatively long way from the walls of the tank - some extra developer makes it more likely that that roll will be developed evenly.