I've used that recipe for the last two years and it has worked great! You can make plenty for the entire season and not spend much money doing so. I normally make 2 gallons a couple weeks before the season and they last through the end. If there is any extra, I just toss it and make new the next year since it's so cheap to make.

I've seen in a few other posts that some people recommend using Baquacil (sp) instead of the peroxide. I've always used the brown bottle peroxide you can find at the drug store and never had a problem. Also works good on the dog if it's gonna be a few days before he or she can get a bath.