SmelteryControl

tank = peripheral.wrap('back')

while true do
  if (tank.getTankInfo()[1].contents == nil) then
    print('Tank is empty.')
    print('Attempting to drain basins...')
    redstone.setOutput('left', true)
    sleep(0.5)
    redstone.setOutput('left', false)
    sleep(4)
  else
    print("Tank isn't empty.")
  end

  sleep(1)
end