The "Other" Pool Chemical - "Nitrate"?

We've used chlorine and now bacquacil. I've heard that there's another system -- I believe it's silver nitrate based, but I may be wrong -- that's cheaper and more effective for SOME pools and water types. We are in unincorporated land and use well water. It's not bad -- bit of iron, use a softener. In the pool, algae's a problem.
I have had NO luck getting information on this pool maintenance system.
Does anyone have any experience with this or know anything about it?
Thanks!
Mark
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First link from google when searching silver nitrate pool http://www.algaebar.com/report.html
a little further down were webstores who sell the chemical but you'r right, there are not any Systems. I think it is added manually

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http://www.freepatentsonline.com/6224779.html
try this

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You realize that the improper use of chlorine relates to symptoms of eye, ear and respiratory infections. what do you think adding nitrate to your pool will result in????
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