Weeding or Harvesting Fertility?

You'll still have to deal with the smelly resultant liquid oozing into the tray somehow, have you got a plan for getting the juice from the tray? I've got a few lidded buckets (leftover poultry pellets tubs) for weeds around the place and use an old soup ladle to decant the juice to a watering can, only smells when I open them. BTW does the juice go off, I found some really old stuff the other day, shall I use it?