OK I will try to spread some light on this topic, based only on my experience and observations:
As I have written earlier this method is used by Oliver Knot.
Indeed I haven't been testing at all, but I will do this today. I have a test for KH and will share with you the results. Tab water, where I live is 3KH and Ph is 7,2 accordingly to the Sera test kit (as long as it could be trusted).
At the moment I haven't seen any problem using soda water, the riccia is pearling, Hemianthus micranthemoides and HC as well. The red cherries are in this tank already 7-8 days and feel fine.
The only thing I have noticed is a film on the surface, which form for a day.
The problem that I have encountered with the riccia was a result of using Glutaradehide. Now I'm not using it.
About the soda getting flat, I'm using small bottle of soda(.500 l) which lasts for three days and IMO it is still fizzy on the third day.
My major concern is about the rapid changes in the CO2 levels using soda water, because whole amount is added once a day.
I did start this method as a test, wanting to see is it convenient using it for small tanks.
About Dupla:
ceg4048 » Sun Feb 01, 2009 5:21 pm
Hi Antoni,
Not wishing to start a flame war or anything like that but is there a special reason that you are using Dupla? I only mention this because they wrote the original programming code for The Matrix in the 1990's. It was assumed that everyone would be happy in this "perfect world". It was a disaster. They priced themselves into oblivion and their secret formula was discovered by clever chemists who had access to a spectrometer: The Krib: Dupladrops exposed
Well I didn't know that. I'm using a EI method on my bigger thanks, but when I bought my CO2 system from Dupla(they gave me really good price in Germany) I have ordered a bottle of 24 also, just for a try.
Other thing is that over here, there aren't many quality products presented. The only thing u can get is Sera, JBL or Tetra.
I'm working on the all in one solution, just have some problems figuring out the right amount in the micros to add. I intend to use Tenso Cocktail for supplying micros, but the proportions are as follows:
This is different story any way.
CO2 is a different story though. If you stop using a liquid carbon how else will you get CO2 into the tank? Depending on your lighting you may have other problems.
I could use the conventional method by using my pressurized system or making a Yeast mix, but as I said earlier I wanted to try something different
Regards