What is the best ingredient for DIY CO2?

[dannyfish]

Hi there

i also try using uncooked rice + baking yeast + baking powder to make co2...
just make it an hour ago, still no bubble yet. will monitor how long can this method can last me..

wow today saw disaster happened haha my tank turned milky wor..dono my fish will survive or not..
wat has happened?? any 1 can advise?
now i switch back to sugar + yeast + soda

[valice]

Did you stick the tube too deep into the bottle?
Maybe due to pressure, some of the concoction has gone into the water...

[grey_fox]

Hi there,

I read about this in www.answers.com on the topic of Yeast :

http://www.answers.com/topic/yeast?method=22

"...A common medium used for the cultivation of yeasts is called potato dextrose agar (PDA) or potato dextrose broth. Potato extract is made by autoclaving cut-up potatoes with water for 5 to 10 minutes and then decanting off the broth. Dextrose (glucose) is then added (10 g/L) and the medium is sterilized by autoclaving."

And the details on "potato dextrose broth" is quoted as :

http://www.answers.com/main/ntquery?...xtrose%20broth

"Potato dextrose broth (abbreviated as "PDB") and potato dextrose agar (abbreviated as "PDA") are common microbiological media for culturing both yeast and mold, but usually not bacteria. (2)

Common organisms that can be cultured on PDA are yeasts such as Candida albicans and Saccharomyces cerevisiae and molds such as Aspergillus niger. (3)

Preparation
PDB can be prepared by boiling a mixture of :

peeled, finely chopped potatos (200g)
dextrose (20g) {I think this means add 20g of sugar?}
In 300ml of water for 30 minutes. The supernatant is then decanted and strained through cloth to remove particles from the broth. The final solution is a light yellow translucent broth. Because it is not sterile the broth may then need to be sterilized in an autoclave."

.....
Well, if this potato soup thingy is the in-thing for bio-labs to cultivate yeats may be it can also do wonder in our DIY CO2 power plant ? Think I shall give it a try this week end.....

Fermented Potatoes = vodka

[dannyfish]

Did you stick the tube too deep into the bottle?
Maybe due to pressure, some of the concoction has gone into the water...

luckily the water became clear the next day...heng no fish mati..

my tube is placed somewhere below the water surface... and no concoction has gone into the water as i saw the bubble didnt reach the tube inside concostion bottle..

dono is it due to the uncooked rice tat causes the water to be milky..

[freshfish]

i used to do 2.5 cups sugar, water, yeast, 1 tbsp baking soda, and i dumped in some plant fert just for the heck of it
used to last me 4 wks with a reactor

DEA when you mentioned 2 cups of sugar , how big are the cups?