The reasons to fine filter are the same as the reasons to filter in the first place.  Better tolerances, better machine life, better finish, longer tool life, less heat, longer machine coolant or cutting oil life, reduced maintenance and overall reduced cost. 

As a rule of thumb you should filter to a level where the particle size is 10% of your tolerances.  If you are working to 0.001'' (25 microns) then you should filter out all particles down to 0.0001'' (2.5 microns).

Eclipse Magnetic Filter can filter out up to 1 microns of fine particle. This product work well in grinding, deep hole drilling, edm, wire cut, honing, lapping, spray wash system and super finishing process. It is the best filtration system that you cant't miss!

Product link:
http://www.davor.com.my/index.php?ws=ourproducts&cid=149541&cat=Eclipse-Magnetic-Filter#openproducts

Contact our Sales Consultant in area Malaysia (Selangor(Klang, Shah Alam, Subang), Kuala Lumpur(Sungai Buloh), Sepang, Negeri Sembilan, Melaka, Johor(Johor Bharu,Muar,Batu Pahat), Pahang(Temerloh, Kuantan), Kelantan, Terengganu, Perak(Ipoh), Kedah, Perlis, Penang, Sabah, Sarawak), Indonesia, Singapore, Thailand, Philippines, Vietnam, Laos, Myanmar, Cambodia, Brunei at sales@davor.com.my.