f the result. Cap and label the other two jars (chlorinated and dechlorinated), pack them in a cooler full of ice, and deliver the cooler to a water analysis laboratory within six hours of collection. You'll have to drive it to the laboratory yourself, or use one of the rapid delivery services. Be sure to give the laboratory notice beforehand that it's coming. Ask the lab to run a test for combined residual chlorine concentration on the chlorinated sample and a fecal coliform test on the dechlorinated LOW-IMPACT SYSTEMS sample. You can use the chlorine residual test to compare with and calibrate your own test, SO that if the bacterial disinfection is work- ing well, you'll know what concentration to look for with your test If, for some reason, you can't get the chemical necessary to remove the disinfectant from one of the samples, take a single sam- ple to the laboratory (the faster the better, within the speed limit). The laboratory can first run a combined residual chlorine test, then remove the disinfectant and run the fecal coliform test. Be aware that the disinfection might not be as effective as the test results indicate. The fecal coliform test should tell you if your disinfection system is working well. Disinfection should reduce the number of fecal coliform bacteria in the treated effluent to less than 200 per 100 mL of sewage. On the other hand, the disinfectant concentration should not be SO high that it sterilizes every living thing in your soil. A residual of 0.1 mg/L in a stream presents the risk of killing fish. No one knows what it takes to kill an earthworm. PART III System Support Solving Problems The first sign of trouble from your septic system will be indica- tions of sewage where you don't want it. In general, the trouble- shooting process is to check each successive part of the system from the part exhibiting the problem to the part performing the ultimate disposal. The troubleshooting process is summarized in Figure 8.1. TOILET WON'T FLUSH If the toilet won't flush (and there is water in t