JamesC,
It's just a straight dilution, I'm not multiplying anything up. My dosing pump does about 55 ml a minute, and my timer is only to the minute (be very grateful if someone can find a plug in timer that is seconds accurate), so for a 15ml dose from a 500ml mixed bottle, I need to dilute that 500ml bottle with 1366ml (but I make it 1500ml to round off to 2 litres in all) to ratio it up for the dosing. I ask because we want to maintain a pH of 6 and the correct use of the mould inhibitor. If I dilute up I will forfeit the pH will I not since pH scale is logarithmic, so I still have to maintain scale for ascorbic acid, is that correct since we still have to make the pH 6 in the diluted solution?