Letter 19002

Algae in copper rinse

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I get a thick, algae-like growth on the walls of my dragout rinse after electroless copper. I use air sparging and room temp city water. Any suggestions?

Kevin Hatch
- Rochester, New York

You might clean out the tank and then try turning off the air agitation. In a draqout rinse, there should be enough formaldehyde from the bath present to prevent the biological growth, but it is possible that it is being oxidized by the air agitation. Alternatively, you could add a little formaldehyde.

Lyle Kirman
water treatment systems - Cleveland, Ohio

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