title_body: Can I substitute Gaggia Descaler for Sage 'the Descaler'?
upvoted_answer: I think the Gaggia Descaler would work fine in any espresso machine. Just use the same procedure and amount that worked for the Gaggia machine (or use the directions for The Oracle). 
  
  I have never bothered to buy any commercial descaler, since they seem overpriced to me. I buy pure citric acid powder over the internet, and use that for both a Gaggia Classic and a Ponte Vecchio Lusso.