It's quite common to see growths in developer rinses which are mildly 
alkaline and contain organics or in finishing rinses like CU-56 but I've 
not seen it in acid plating rinses.  The best approach I've seen is to add
a strong hypochlorite bleach to the tank once a month to kill the 
bacteria and then rinse thoroughly and refill.

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On Tue, 13 Feb 1996, dhoppe wrote:

>      Has anyone had any exposure to fungal growths in thier plating line 
>      rinse tanks (especially after the acid cleaner).  This hyphae is quite 
>      hearty and nothing seems to kill it.  It is not an algae.  I've even 
>      tried glutaraldehyde, a common antifoulant used in the metal finishing 
>      industry, to no avail.  What does anybody say?
>      
>      Don Hoppe Jr.
>      ZYCON
>      [log in to unmask]
> 
>