Those tips were contributed by my friend Gary Deutschman see the preceding page 275 - 279 Gary is the inventor of AZN03 http://www.marine-monsters.com/front/products/azno3.html and http://www.reefs.org/library/talklog/g_deutschmann_092097.html But Yes, thats essentially the method of regeneration eg soak in caustic (lye mixture) rinse , muriatic acid and rinse. I've never personally done this although I've head many who have and the claims are accurate. Here is a more complete article http://www.reefs.org/library/article/g_deutschmann.html Robert