Dirty EDM water

I am currently playing with my new toy, an RC EDM machine.

I have a question about the waste water. After being run thru the EDM
process, it gets 'contaminated'.

Since the only components are the water and what is in it, the
electrode and the part, is the water industrial waste ? or just dirty
water with lots of copper and steel ? (carbide, cobalt…???)

It seems that that the tiny bits are colloidal or fall out as
sediment.

Since I have well water, dumping anything down the sink has the
potential of coming back next month or next year.

Am I worried about nothing or starting a new `Love Canal'?

http://www.epa.gov/region02/superfund/npl/0201290c.htm

It seems I could evaporate the water and trash the solids. Putting
it thru a paper coffee filter took out most of the solids. I haven't
looking into something that would precipitate the solids or some
other means of cleaning the water.

So, the questions are…
Is this a problem ?
If so, what can be done about it ?

Dave
(btw, I posted this to the EDM-CNC list while waiting for permission
to post here. I thought it might be too far off topic)