Yes but I am looking for a blow valve as a precaution against the
possibility of the airstone getting clogged and causing my 2 liter bottle to
explode (I have seen pictures and read postings on this happening.) Since I
have read interest from people I will describe my setup, and I will post a
picture of it later (although its pretty simple)

1) Get 2 liter bottle (I got a $.49 seltzer water bottle since its clear)
2) Drilled 1/4 hole in top of cap and silicon sealed tubing inside of it
3) Since my co2 reactor will be beneath my tank, I have installed a
check-valve on the line to prevent reverse-siphoning
4) Recipe I put in bottle is 6 cups water (~1.5 liters) 1 cup sugar, 1/4
tspn baking soda, and 1 tspn of yeast (NOT the instant yeast, but bakers
yeast) (I might add that the baking soda DOES help in the co2 production)

I run the airstone end of the tube down to the bottom of my aquariium and
anchor it there with one of my rocks.

For those of you who suggest running the co2 outtake to a powerhead... DONT
DO IT... this is for the simple fact that even a very small powerhead will
pull more air that the co2 reactor can provide, this results in a very good
probability that your 2 liter bottle will collapse from pressure. (Thus
sucking that nasty concoction into your tank and probably killing some
fish/plants) It is best to put the the airstone underneath a flow of water
so it circulates within the tank and has more time to diffuse.

I am making a new co2 reactor that uses an empty wine jug (glass) and has a
bit more solid structure.... This is the reason I am looking for a blow
valve is so I can make sure that too much pressure doesn't build... I might
just use a rubber stopper (with a copper tube coming out of it... easily
aquired at a scientific supply type store) and a check valve... but the
benefit would be a bigger water/sugar/yeast concoction that produces more
co2

"Trygve Lillefosse" wrote in message
...
So here is my question: Does anyone know of a good or common place to get
a
blow valve? (I.e. a valve that will discharge within a certain PSI range)
I
would like to make my DIY system fault tolerant, but I am just stumped on
where to get the blow valve... any ideas? Thanks!

The pressure will not be able to build up since it will go out the
airstone. Would'nt be to concerned.

SEE YA !!!

Malawi, The Fisher King - Ruler Of The World
Conquering the world for YOU since 1972.