I am currently using RO water in some of my processes. I'm not having
     any problems with this whatsoever. The RO is very clean but be aware
     that it is as aggresive as DI. If not more so.

     Mike Doty
     Hadco TCE


______________________________ Reply Separator _________________________________
Subject: Re: [TN] R O plant
Author:  "Robert E. Mesick" <[log in to unmask]> at SMTPLink-Hadco
Date:    12/18/98 1:49 PM


Date sent:              Thu, 17 Dec 1998 18:32:07 +0500
From:                   N Radhakrishna <[log in to unmask]>
Subject:                R O plant

> We are planning to recycle water from our production centers including Tin
> plating and tin stripping using Reverse Osmosis. any feedback  on the same
> will be much appreciated.
>
> Regards
>
> n Radhakrishan
>

RO won't work with Tin.  Tin will plug it immediately.  Buy a very small test
module first to try.  You will need to remove ALL of the Tin before it hits the
RO.
 Tin is a big problem for microfiltration systems also.  It is very hard to keep
Tin
in solution and the precipitated Tin plugs the membrane pores.  RO's work best
with VERY clean water.  5 micron filter first.  Then make sure the maximum
solubility of all of the ions entering will not be exceeded when the recovery
ratio
is maximized.

Segregate tin and recycle the rest less photoresist.

See www.remco.com/pcb  for recycling info for PCB shops.

Good luck,

Bob Mesick


Remco Engineering
Water and Wastewater Treatment Systems
http://www.remco.com
[log in to unmask]

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