----- Original Message ----- From: "Pengalanty" <[email protected]> To: <[email protected]> Sent: Friday, September 03, 2010 6:35 AM Subject: [canals-list] Re: Swedish Bolin Pumps (And Anti-Freeze in Systems)
(snip) > I always wonder where all the sludge comes from. ~Allan~ Basically, the radiators. The iron combines with oxygen in the water to form magnetite (Fe3O4, IIRC). The process is encouraged by electrolytic action between the steel radiators and copper pipes. Iain
