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Descaling gone bad (?)
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Senior Member
Joined: 6 Dec 2010
Posts: 6
Location: Quebec
Expertise: I love coffee

Espresso: NS Oscar
Grinder: Ascaso i-mini
Drip: Cuisinart Brew Central
Posted Fri Apr 19, 2013, 8:23pm
Subject: Descaling gone bad (?)

Hi folks

Two days ago I thought it was time for my bi-annual descaling on my NS Oscar.

This is my routine:

Turn on the machine for a couple of hours
Add one pack of Dezcal to 750ml of water
Slap the tank back in with the solution
Flush out approx 400ml of water
leave the machine on 30 minutes
Shut off one hour
Flush out water till tank is empty
shut off one hour
Fill tank with fresh water and flush until clean water comes out.

Now I notice on my first clean water flush that something shiny is inside the cup. I look closely and see about 15-20 small copper shavings or shards (dont know how to call them really).
Really tiny like specs of copper dust. Some look a little bit bigger like the size a tiny wooden splinter - yanno those that end up under your nail !
So I think no worry, must be a bit of copper from the boiler that loosened of from the descaling process. So I keep flushing and flushing and flushing and the buggers keep showing up.
I also am noticing less heat coming from the machine. When I used to let it sit a while, the water would vaporize quite a bit on the first flush and then water would come out with some quantity of steam, which it doesnt anymore.
Tried to get a reading with a crappy oven thermometer and I'm getting 150 degrees (prolly close to 180 with the styro test).

Anyone ever witnessed this? Any idea what might have happened?
I'm thinking I should change the heating element and see what's up with the boiler but any help/advice prior to getting that done would be appreciated

Oh yeah I have the Sirai P-stat and the machine I believe is a 2008


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