Archived posting to the Leica Users Group, 2001/01/29

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Subject: Re: [Leica] @#&$$& Watermarks!!
From: Brian Reid <reid@mejac.palo-alto.ca.us>
Date: Mon, 29 Jan 2001 18:25:36 -0800
 
I've just done some reading on PhotoFlo.
It is basically a very refined form of soap.
As such, it reduces surface tension in the water.

If you have "soft" water, then a tiny amount of PhotoFlo will do thd
job, and more than that will cause problems. If you have "hard" water,
you will need more. 

Here in California where I live we have unbelievably hard water. It
measures 18 degrees on the dH scale (DIN hardness). My brother who
lives in Maine and who has a water softener in his basement to soften
his well water has 1 degree dH of hardness in his water. If he
developed film, he would need to use about 1/20 as much PhotoFlo as I
do.