Spica, we do NOT recommend SWCG's as a cost saving measure. Instead tell people that using the BBB method manual is cheaper, as a rule, than using a SWCG, once you look at all the costs. They might save money for people who are frequently away, since algae episodes can be so expensive, and a SWCG makes it much easier to keep a pool chlorinated while no one's at home. So, while most people who have them seem to like them, in my judgement they are only 'essential' for 'road warriors'.
We *have* seen some problems with corrosion, but these seem to be somewhat localized to dry areas of the country, and to pools using specific kinds of natural stone. But, we haven't figured out what kind of stone that is, except it doesn't seem to be limestone or granite.
Sean, I was *guessing* was that they WERE using copper, but were treating the deterioration of the electrodes as a 'feature' (it adds algicidal copper to the pool) rather than a 'failure' (the SWCG stopped working). However, when I looked at the schematic, it appears I was mistaken, and you are correct.
In the schematic below for the "Krystal Clear Saltwater System " (~$270 @ Intex), part #4 is listed as "ELECTROLYTIC CELL (WITH TITANIUM PLATES) (O-RING A INCLUDED) 11233" for $131, and #5 is listed as "COPPER ELECTRODE 11234" for $54. Replacing parts may not make sense, however. The complete unit is available from Amazon of for less than $170 (May 2012): Intex 54601EG Krystal Clear Saltwater System
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