Originally Posted by SKSuser

The trick with the jello is that you shouldn't add it to the water. You need to actually make jello and put it in the fridge in bottles. I'm going to PM you a link from another forum that shows how to do it. I had a site that was better, but I can't find it anymore. If I do, I'll post that link, but I don't want to post a competing forum's link here.

I've never tried it myself, but its supposedly more consistant because the yeast has to eat through the jello to get to the sugar. This slows/lengthens the process and eliminates the burst of bubbles right after you make the mix.

As for the rest of Levasseur's instructions:
Its great except there is an area where you can save yourself some money. The RC car bulkheads in the lids are unnecessary.
If you remember back to highschool lab you may know what I'm describing. A common way to cap a glass bottle or secure a tube into a cork stopper is to drill a hole that is slightly too small for your soft hose but too big for your hard tube. Then wedge the soft hose in the hole and jam the hard tube into the soft hose. The soft hose acts as a gasket for the hard tube.
I use about a 1" piece of hard tube, and a 1/2" piece of soft hose. You could make it all one part with the tube that travels into the filter bottle or into the tank, but I like to be able to detach the bottles from one another without having to seaprate that hard fit in the lid.

Originally Posted by qpixo

I'm using exactly same method to diffuse CO2 in my 10 gal but only 1x2L yeast bottle. Since I have it, my highest amount of CO2 is 23ppm.

Another thing, when I do weekly water change usually 1/2, after the change I test the amount of CO2 which is tradically drop around 10-13ppm. I have to wait a 2-3 days to get it back. Is that normal?

Does anyone know how to get a little bit more around 25-30ppm?