Although it is a glorified DIY yeast system, I should support it I think since Hagen is promoting CO2 and plants finally.
There will always be folks that want to spend 25$ vs making something for less than a 1$.
If folks are claiming to be cheap as a reason to get one, why not go all the way here?
There must be 50 sites detailing how to make these.
Danger of blowing up? Well, for those that try to block the flow of gas from a DIY set up, any pressurized device will cause an issue there. Are you scared to remove a beer cap? That's about the danger level here. A rigid juice bottle works super and never "blows up" nor collapses.
A powerhead is a better device for dissolving the CO2 and easier to control.
Sugar and yeast are easy to get any supermarket.
As far as Gas tank CO2: I use about 10lbs on 175 gallons worth of tank volume per year. Cost for refill: 8$.
Labor involved: 1 minute per year. Results in better plant growth and enough CO2 for the plants.
You never hear of folks selling their CO2 gas tanks, and for good reason.
Now I'll itemize the CO2 gas tank vs the Yeast for a 75 gallon tank.
Reg: 53$
www.kegworks.com
Needlevalve: Clippard: 10.91$
Gas tank: used 10lb from Fire extingusher company: 40$ but most avergae about 75$.
Tubing etc about 2$.
Reactor powerhead: 45$
Total: 150-190$
Refill cost: 10$ per year.
Labor: virtually none
Yeast system for a 75 gallon tank:
You'll need at least 3 of these, 75$
Supplies: sugar and yeast: change every 2-3 weeks to keep enough CO2 in the tank x 3........
Labor, 5-10 minutes every few weeks.
Problems: "Gee I forgot to change the yeast brew" => poor CO2 levels => algae BBA, GW etc. A great deal more labor.
How much do you pay yourself for "doing the dishes" changing these bottles, remembering to rechange them, fiddling with them not having enough CO2 most of the time etc? Less plant growth, more hassle, folks blaming things of PO4 instead of CO2.
I hear the same every week concerning algae. One of the first thing I ask often: do you have DIY yeast CO2?
Adding some CO2 vs none will increase plant growth a good deal.
But adding the correct amount is not simple using Yeast and requires some work, technique and keeping the brew fresh. I did it for 10 years.
One of the best things folks can do: get gas tanks for CO2.
But systems like this and DIY are great since folks can see that it really improves plant growth.
We can squawk all day on the net but when 20 million aquarist see the ad in various mag's or at the LFS, the marketing power really helps send the message out about CO2.
That helps the hobby in general.
Thrifty folks will figure out ways to save their $ later etc.
If you plan on more than one tank or want a larger tank, then gas tanks quickly become much more manageable both on the wallet/purse and the aquarist. For a 20 gallon tank or two and that's all you plan on having, DIY is the way to go.
Regards,
Tom Barr