OK, in my constant search for more information about the CYA beast, I found this - It's $50 per gallon at In The Swim:

Cyanuric Acid Remover

A REVOLUTIONARY SOLUTION TO "OVER-STABILIZATION" IN SWIMMING POOLS & SPAS!

Quickly reduce the level of cyanuric acid to comply with local codes, and avoid costly water problems.

Eliminate the time consuming process of draining and re-filling the pool.

Will not affect the water balance chemistry when used as recommended.

Pool can be open again only 15 minutes after application.


Dosage: One gallon of Cyanuric Acid Remover per 10,000 gallons of pool

Of course the ingredients are not listed anywhere that I can see. Does anyone have any idea what this stuff is?