Boiler Descale- Hey Mike Sabol

My message service on here is still SOL, I can write messages, It's just that nothing happens when I hit send. Yes, this is the only website this happens to me on. So, I've descaled this boiler several times using the Everpure Scalekleen in huge amounts with boiling water for several hours, but I've still got a rock quarry happening in there. Got any insight on anything else I could possibly use that's not going to make anyone sick? I've also used a credit card to scrape the inside but it's still there.

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