We pumped our septic tank 1 1/2 yr. ago. It was partially pumped a week ago because the tank alarm signals every 4 days or so. We were told we have excess water in the tank. Our system is connected to a sand filter with lines out to a drainfield because we live on a slope with clay soil. The system is 10 years old. We're not sure what can be done to ameliorate the situation.