Some people in other discussion forums have been writing about dissolving a 5 liter pack of Xtol in only half of the volume for convenience.
I have now twice tried in, and ended up diluting it up to full 5l to get it dissolved. I used ion-exchanged water, magnetic stirring and several hours.
I'm also worried about possible oxidation caused by strong agitation for extended periods. Anyone here who is successfully doing it? Yes I know it's against the instructions, but so is diluting it 1:3 too.