RogerP wrote:This method is to test the approximate pump pressure by measuring the flow. But in my case I had too much pressure. I got 190cc in one minute (12.5 bars). I added a washer to reduce the pressure. Then I got 350cc in one minute (8.2 bars). But I don't know what version Silvia you have. Later versions don't require washers for adjustment.

If you are confident that your pressure is around 9 bars then it would seem that the grind is too fine.

Mine v1 for some reason has an adjustable OPV valve, making it a lot easier.

The grind should be the same as always as I haven't changed it for years. I have a rocky grinder.

I am doing doubble shots with the grind set on 4 on the rocky. It has not been a problem before, or rather before I could descale and backflush/clean it into working again.

Regarding descaling, should I continue to descale it as long as the water coming out is greenish indicating that there is still calcium to react with?