I still disagree. This myth has been debunked summarily. Dose til your heart's content with PO4.
To the OP, you will more than likely be dealing with some BBA if you're going to use DIY CO2. It's very hard to keep these setups consistent. Even if you change bottles religiously, you'll still be dealing with too many variables to keep a rock solid bubble rate. I recommend trying out DIY by all means. It's a good stepping stone to seeing what CO2 can do for you. Before too long you'll be saving up for pressurized!