[pure-silver] re-using DDX

I was reading the DDX bottle today and noticed the following:

"For economy, DDX can be reused to process either a number of films individually or multiple films in batches. If a series of films is being developed in a spiral tank, compensate for the loss of development activity after developing the first film (or batch of films) by increasing development time 10% for each successive batch. This relies on the used developer...being poured back into the working strength solution's storage bottle and mixed with the fresh, unused part of the developer before processing the next film/batch."


??? I don't get it. Pour the used developer back into some fresh working solution and then add 10% to your times? But, how much fresh developer? And how does that save any money if you need fresh developer to do it?

--shannon
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