Steven,
I would suggest two products for your consideration.
1. Roebic Laboratories K47 Cesspool Treatment
[HERE]
2. Gempler's Farm Digestant
[HERE]
Roebic Labs has extensive experience in this field, both commercial and residential. I use their septic treatment regularly. The composition of the cesspool treatment is different than the septic treatment since cesspools are more aerobic, while septic systems are more anaerobic. Rid-X imho is not suitable for cesspools. You can find Roebic products at TSC, and Wally World, too. Just make sure you use the K47.
The Gempler's Farm digestant would also be a good addition to your cesspool. It's sold for use in sewage lagoons, but if you read the specs, it can be used effectively in cesspools as well.
To get ahead of your problem, I would use a healthy dose of the K47. Depending on the volume of your pool, I'm thinking 2-4 bottles. Then wait about a week or two, and see how it sweetens up. If ok, you could then go with regular (weekly or bi-weeky) dosing with the Farm Digestant. Mix up the dry powder with water. Let it sit for an hour or so to activate the bacterial spores into poop-munching live bacteria, and then flush down the commode. I would repeat the K47 about every 6-9 months down the road just for insurance. When you use the right bacteria, you can't really overtreat your system.
Hope that helps... it should be better than going around with clothespins on your noses /forums/images/graemlins/grin.gif