White precipitate after using DS3

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I used DS3 last week because of bonking from my Flamingo in this very hard-water area. It was very effective in curing the loud bonking. I gave the syst a good drain, rinse, and two cold refills and drains and it seemed prety clean.

However I noticed some white Precipitate or Sediment in the F&E after a few days. As I was draining down again to fit some new TRVs I stirred it in during the draindown and it all seemed to wash away.

However after fitting the TRVs and refilling, one of them leaked, so I drained down again, hot. The plastic box I used to trap the dregs of water from the rad, the next day I found white sediment in it, stuck to the bottom. it did not rinse away with water, but softened so I could rub it off with my finger.

Does anyone recognise this?

I had used DS40 (but it made no difference) a week or so before the DS3, and rinsed it well. I have been using hard water for the fills and flushes.
 
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I think it might be a sulphonate, which I believe is harmless. I'll hit wikipedia and see if I can make sense of it! DS3 is sulphamic acid - start there.
 

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