I have some Mayhems UV Black Oil colored fluid for my loop and its way too expensive to flush radiators and blocks with,
Is this stuff fine to flush and leak test components?
http://www.ebay.co.uk/itm/De-ionised-Water-Deionised-Distilled-Water-Bottle-Pick-Your-Size-De-ionized-/171254674195?pt=UK_DIY_Material_Nails_Fixing_MJ&var=&hash=item27df92f313
(WC Noob, first loop)