After a few inspections, you should be able to adjust the schedule according to the rate at which solids accumulate. Make sure you are aware of the types and amounts of extra waste materials that are poured down the drain. Limiting the use of your garbage disposal will minimize the flow of excess solids to your tank. Garbage disposals usually double the amount of solids added to the tank. Do not pour cooking greases, oils, and fats down the drain.
Grease hardens in the septic tank and accumulates until it clogs the inlet or outlet.
Grease poured down the drain with hot water may flow through the septic tank and clog soil pores completely. Pesticides, paints, paint thinners, solvents, disinfectants, poisons, and other household chemicals should not be dumped down the drain into a septic system because they may kill soil microorganisms that help purify the sewage. Also, some organic chemicals will flow untreated through the septic tank and the soil, thus contaminating the underlying groundwater. They do not reduce the need for regular pumping of the septic tank. Some of these products contain organic chemicals and may even damage the drainfield or contaminate the groundwater and nearby wells.