The hard stuff is mostly calcium phosphate, anything acidic (like vinegar, CLR, hydrochloric acid, phosphoric acid i.e. cola, etc...) will help remove these deposits. Acidic pH swings the equilibrium more in favor of free calcium and protonated phosphate, thus the deposits go away. CLR really works the best, but I do not think you shoul use that in your snake dishes unless you really thoroughly clean it afterward.
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when life hands you lemons, make super lemons, bumblebees, etc...

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• ...that crust in the water bowl - amarilrose, Wed Nov 15 20:41:39 2006
• RE: ...that crust in the water bowl - blowitch, Wed Nov 15 21:30:39 2006
• RE: not the tap - amarilrose, Wed Nov 15 21:37:29 2006
• RE: not the tap - hoot, Wed Nov 15 23:23:39 2006
• Oh but it IS your tap - Aviansinoil, Wed Nov 15 23:27:16 2006
• Calcium phosphate - rwoodyer, Thu Nov 16 00:20:06 2006
• RE: Calcium phosphate - morphed, Thu Nov 16 07:44:38 2006
• RE: Calcium phosphate - jyohe, Thu Nov 16 16:31:15 2006
• RE: Calcium phosphate - morphed, Fri Nov 17 07:52:14 2006
• Distilled water............ - Brandon Osborne, Thu Nov 16 10:35:39 2006
• Use Lime-Away.......n/p - spenden, Thu Nov 16 09:20:33 2006
• RE: ...that crust in the water bowl - Melinda666, Thu Nov 16 14:50:22 2006
• RE: ...that crust in the water bowl - jfmoore, Thu Nov 16 18:03:25 2006