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CO2 Electrolysis
I have some experience with the CO2 electrolysis
method of generating CO2. I have used the Nisso 900
model that was available thru m3.
The design sounds exactly like what Bob described. I
have a rather negative report about it though. Yes, it
produced some CO2 in very fine bubbles, like
"smoke." It was pretty easy to set up and the carbon
block lasted 2-3 months on my 20g tank. I had to turn
it on full blast to get significant CO2 generation
though; and at full throttle, it created about 9ppm in the
tank -- a little low for my taste.
Also, whenever I changed the carbon block, the new
one gave off something the SAEs hated. Sometimes
they jumped out of the tank! Sometimes a few just
died overnight. The ghost shrimp, if any, also died. I
started turning it off at night (ok, I run all my CO2
things all night with no problem usually). This only
helped a little. I have no idea what harmed the fish
and shrimp since the unit is supposed to only put out
CO2, H, O,???
Since I couldn't figure it out and hated losing the
animals so frequently, I gave up on it. It's now in the
closet. I replaced it with a CO2 gas cylinder,
regulator, needle valve, ADA scintered diffuser, etc.
If anyone wants the Nisso 900, it is for sale for a lot
less than I paid for it. Email me privately if you are
interested.
Roxanne Bittman