How to PREVENT hard water stains in the toilet?

Does anyone have a solution for preventing hard water stains in a toilet? I've read a several posts about how to get rid of them (e.g., pumice stone, The Works, CLR, etc) but I am looking for something that that prevents them in the first place--like some kind of time release additive for the tank.

Thank you,
Jodi

Answers:
You're using well water..right.
Are there any tamarack trees in your area, close to your water source.. if so, it's most likely the trees that's causing this. The tamarack trees have tannin.. a very good dye.

You could use the Clorox tablets to help prevent hard water stains for beginning. In some cases though, you'll still have minimal staining. Then you scrub.. <smiles>

You could change the color of your toilet?

Other answers:
Just flush every time you used it.
Just flush every time you used it.
Gosh, I will be watching this one. I HATE them, and once they start it is a full days event to get rid of them.
try chlorine tablet`s
I don't know how to prevent them, but a good remover is Harpic Limescale remover. It is in a blue bottle. I had a similar problem where my loo kept getting really stained and I used it every time I cleaned the loo and it worked great.
Try the new toilet bowl cleaner with teflon. I did, and the stains didn't seem to show up as often on the bowl. (of course, maybe this is wishful thinking.) My water is hard enough that I get that funky black ring at the water line before the end of a week. I've also heard tips to drain all the water out of the bowl, dry it completely, and then apply automotive wax to the inside. I have never tried this before.
clean with coca-cola. works!
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