Originally Posted by f1ea
Here's a good controversial one: i think Excel is much more techy than DIY CO2. Excel is an industrialised product and YOU have to add it every day, there is no natural process going on in the tank or around it to synthetise Gluta and introduce it to your tank. You can't make Gluta from stuff you'd find in your patio.
Let us not forget that gluteraldehyde is toxic--very toxic. I used to work with the stuff long ago when I was a lab tech, and all those warnings on the label are there for good reason. Even the fumes can cause permanent scarring on your corneas.