Custom Bio Coag Recycle Wash Rack System at Sky Jack New wash rack installed at Skyjack in Phoenix, AZ. Using the new SCE Bio Coag Custom System consisting of 20 micron indexing paper filter, (3) 500 gallon cone bottomed tanks, coag mixing and floculation technology, biological microbe injection, automatic pH control, auto purging of the tanks, aeration, ozonation fo the finished water tank.