Does anyone have experience using dross eliminators?

 LinkedIn: Does anyone have experience using dross eliminators in solder wave processes? Do they really help or is it a waste of money?
I am trying to figure out a way to reduce the amount of solder we are using in our wave process(Lead Free and Leaded).

Andy - this is a popular topic because of the high price of tin.

Possible headline: New interest in solder dross recovery technologies

Background... high price of tin etc..
Brief description of different technologies

LinkedIn Group is:

Surface Mount Technology group

China Becomes the Hot Spot for Global Electronics Manufacturing Giants

EMSNow: According to the statistics released by the Ministry of Industry and Information Technology, the main business revenue of China's electronic information manufacturing enterprises above designated size in 2011 achieved RMB7490.9 billion Yuan, a year-on-year growth of 17.1 percent. Going through the global financial crisis, China is making steady progress in its electronics manufacturing industry scale

Through continuous development and optimization, Air Products' Inert Wave Soldering Technology Gen II enables customers to reduce manufacturing and material costs, including reduced nitrogen flow rates; significantly increase soldering joint quality; and transition to lead-free soldering technology with minimal effort, addressing the major issues faced by the electronics assembly and packaging industry.

This technology proven to be cost-effective: Saving up to20-40% of solder consumption, reduction up to 60-90 % in dross formation, reduction up to 10-30% of flux volume per board consumption, reduction up to 70-80% in equipment maintenance, reduction in soldering defects and rework, and easier post-soldering cleaning.

Options for Reducing Dross

CircuitMart: "Options to reduce dross in wave soldering systems are:

Use nitrogen blanket over the waves, depending on cost of nitrogen gas,
Use oil blanket over the wave soldering pot (beware of any oil contamination)
Use the narrowest width of wave required, eg, don't buy a 24' wave for 6' width PCB
Use selective wave soldering machine if there are only few components to be soldered
use the lowest wave height required, cut the thru hole lead length to the shortest possible.
use only good quality solder bar, some cheap solder bars are recycled from solder dross
Use solder recovery systems, that squeeze hot solder dross to separate molten solder from oxide
Turn on the waves only when the PCB is near the waves (towards the end of preheating zones), and not permanently on."