Citric Acid Flush Precipitate

Joined
Mar 3, 2009
Messages
222
Location
Fort Erie, ON
I've done several citric acid flushes on older cast-iron engines and I've noticed that there is a white precipitate that settles out.

Any idea what this white precipitate might be?
 
I would have used filtered water from my pond for the flush water. I was expecting that there were calcium and rust deposits in my engine as previous owners may have used tap water for coolant.
 
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