: What products are available to deal with a wet patch problem, but no odour. Do they work? : Also what household chemicals etc should be avoided.David, you must describe in more detail what the problem is that you are experiencing. Include information regarding the age of the system, the estimated average daily volume of sewage being applied, the type of soil in the vicinity of the leach field, the size of the leach field, and an indication of the type and frequency of regular maintenance the system has received. Also explain what you mean regarding a wet patch problem. JWA