Kudos to your efforts if it was me, having replaced my boiler after the boiler flakes issue with a brass one. If you had gone through the effort of removing it getting a new aluminum one is not that expensive and for my time 2 hours is a lot of time. But if it is running normally again than you should be good, but like I said a replacement aluminum one is inexpensive and a brass replacement is a nice upgrade if you can afford it.
this post was submitted on 27 Jan 2026
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Thanks! I took a look at the brass boiler and I’m thinking I might spring for that. I love the Gaggia so much after 7 years I still dont have any plan to replace it. This could be a good way to breathe some new life!
The Gaggia is a nice machine, especially if you mod it.
You should consider testing your RO water and replacing the membrane more frequently. There shouldn’t be that much hardness there. My water comes in at about 550ppm and leaves about 20-50 (90% is when you’re “supposed” to replace the membrane from what I remember). I know it’s different than a boiler, but i don’t have scale in my kettle over about 7 years. I recently got a water softener and plumbed my RO into it which should help with longevity (RO was originally invented for desalination).
In the image it looks like there’s some pitting starting, so I’d stop there with the chemistry or see if I can find an alternative.
Agree with checking membrane but also using just pure RO can be corrosive to metal parts. Wonder if some of this is more corrosion than scale. Checking pH and KH level as and optimizing these often with just a splash of tap water moxedin the reservoir can help and might even make coffee taste better too
Good idea on testing the water. I had it installed and just assumed the best.
I think most of the scale must’ve come from the first 2 years when I didn’t use RO water. My kettle doesn’t have any scale in it either and I haven’t had to descale it once since we started using RO water.
Dang, how long have you been using it? I also only use RO water with my GC but I'm hoping the monthly descale gets whatever builds up. I had the boiler flakes and got a replacement unit also because of electrical issues (GFCI tripping randomly) so I think I just have the regular aluminum boiler now.
About 7 years! Some on RO water, some without. I was a horrible owner but came around in the last 2-3 years with better maintenance.
Enough that it'll take the USB-B, again.