Someone just recently brought a very good point to another thread that I'll repeat.
When you harvest your crop and the 5 additives you bought are included into the over-all costs of your cured weed, calculate the per/ounce cost to you.
If 4 of your additives added 25% to your cost, and only gave you 1% more weed, it's just not a good idea.
I use General Hydroponics 3 part Flora Series. It's all I use. Including electric costs, I pay $14 USD per/oz to grow my weed. The weed itself is so strong that some friends won't even smoke it. They tell me it wastes them too much (??? I thought that was the point).
IMHO, I would be wasting money if I added "Super Duper Bloom Burster" and 10 other things to what already works very well. The cost increase per/oz just wouldn't be worth it.
Same thing with the Carbonated water. You can mist your leaves with it, and yes, the plants will use the extra CO2, but is it really worth the effort in the final yield and costs?