Wow, that's actually a lot less than I expected. How does this unit work? Does it sit in a tank you dump your chemicals into, or does it actually sit in your trays during use, or is it some other method? Up til now I've always just dumped mine down the drain, but with the current spot price of silver I'm starting to think, that at this price, it may be worth my time to recover. I understand the recovered product is 99% pure, is that true?