Copper Sulfate in Laser cooling

[OsiViper]

Are the biocides used in Computer Water-cooling safe to use on the laser tubes? It's meant to prevent algae or scale from growing in the water or tubing.

The ingredients in it is just 95% DI Water and 5% Copper sulfate. It is put into the water at 1 drop per Liter of water, so its not very strong.

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[underthetire]

As long as there is only plastic or stainless fittings. Di water and brass or other metals can get pretty ugly.