Anon: Thanks for the info. No problems there about mixing it with distilled water, I do that with my chemicals...either distilled or reverse osmosis water.
Alan: Thanks for the feedback Alan! It's good to know Excel can be reused..at least 9 times. I normally reuse the batch of developer that I've made (normally just 600ml) up to 6-7 times..or until the color is 'off'. One question: Do you pour in the whole 1L of the Excel working solution that you've made into your developing tank? I don't think my tank will take 1L.