woodlandfarms said:I have to say I am not sure what it was. Clearly ferous (cause it stuck the the magnet). PT has a 10 micron filter, a lot of guys in PT land are working on secondary filtering to take the machine to 2 microns, usually by using a filter cart. So, It did remove something out of the system so additional filtering is always a good thing, just not sure how damaging something like that sludge really is...
Carl