Intersting info

The following ling might be of interest:

http://www.schneiderkreuznach.com/tipps/unterwasser_e.htm

Interesting data, Paul. Thanks for sharing it.

Although I would say that they are definitely erring on the side of caution when it comes to filtration. CC50R in 8 metres of Hochseewasser! Seems a bit over optimistic too me. I wouldn't go much deeper than 4m unless you were prepared to give WB a good push! And probably 3.5m in more turbid conditions.

Alex

p.s. Last weekend I wrote the first draft of my Magnum Opus on filters. Which is 3500 words long so far. And I still need to go to the red sea and do the bit on filters for black and white underwater! Hopefully should be published by the end of the year.