I'm on my second plumber visit in 6 months because of those same tablets. The first guy told me they use a chemical binder that doesn't break down in cold water pipes, just keeps getting harder over time. $450 is actually reasonable for Denver though, my guy in Portland charged me $620 and said he's seen five other houses with the same problem just this year. Those TikTok hacks are great until they cost you a mortgage payment.

Tbh my uncle fell for one that looked like Amazon but the url had a double a in the middle, never clicked a link since.

Dude yes, @adam_baker nailed it - I stopped grabbing variants and my wallet stopped crying too.