On Fri, 12 Apr 2013 04:22:09 +0000 (UTC), "Danny D."
wrote:

On Thu, 11 Apr 2013 20:09:20 -0700 Oren wrote:

pour a half cup of pool acid in the bowl - it will fizzle.
You then know it is working on the minerals.

Oh, it fizzled allriht!

I gathered the materials listed in Oren's instructions:
http://www2.picturepush.com/photo/a/...g/12668150.jpg

I was going to use a protective facemask ... but they suck:
http://www2.picturepush.com/photo/a/...g/12668070.jpg

I took off the cover of the toilet bowl tank:
http://www3.picturepush.com/photo/a/...g/12668071.jpg

I wrapped the bowl with plastic wrap to keep fumes inside:
http://www5.picturepush.com/photo/a/...g/12668073.jpg

The rubber tube on the funnel turned out to be useless:
http://www2.picturepush.com/photo/a/...g/12668075.jpg

And, I started pouring 28% muriatic acid into the 'thing':
http://www3.picturepush.com/photo/a/...g/12668076.jpg

As Oren mentioned, it bubbled and hissed like a caged tiger:
http://www4.picturepush.com/photo/a/...g/12668077.jpg

And bubbles were even forming in the toilet bowl tank itself:
http://www5.picturepush.com/photo/a/...g/12668078.jpg

The vertical tube itself encrusted with white deposits bubbled:
http://www1.picturepush.com/photo/a/...g/12668079.jpg

After about 1/4 gallon of 28% HCl, I baggied the vertical tube:
http://www2.picturepush.com/photo/a/...g/12668080.jpg

The whole thing is bubbling away as we type:
http://www4.picturepush.com/photo/a/...g/12668082.jpg

As I sit down to a belated dinner with my kid sister & progeny:
http://www3.picturepush.com/photo/a/...g/12668081.jpg

(I will report back in about an hour - for better or worse.)

Before you flush, use the nylon toilet brush on the weakened stains.
They should brush right off.

We did not go so far as to say empty the tank of water. Hopefully
nothing is damaged by acid on the metal tank parts.

The hose on the funnel isn't necessary.

An empty bowl without any water is best IMO.