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• The dosing chamber in a single -tank system contains a pump vault with a removable cylindrical screen of inch polyethylene. In addition, the outlet compartment of the septic tank in a two - tank system contains an effluent filter with a removable filter tube or screen. In either case, whenever the septic tank is inspected the filter tube and/or screen should be removed and rinsed into the inlet compartment of the tank with a garden hose. PUMP, PUMP CONTROLS AND ALARM The pressure dosed septic system incorporates a pumping system in the pump tank or dosing chamber (depending on system specifics) that pressurizes the disposal field. The pumping system is controlled by liquid level control (float) switches which normally require no maintenance. The pump is a submersible, effluent -rated unit designed for wastewater applications, however all pumps have a finite life span, The pumps used in most pressure dosed septic systems may be expected to last an average of about eight to fifteen years. The system's pumping chamber is also fitted with a high liquid level float switch which activates an alarm mounted in the control panel (the panel is attached to the dwelling or garage). In the event of an extended power or pump failure, the alarm may sound indicating that the liquid level in the dosing chamber/pump tank has risen above its normal level, A high pumping chamber liquid level can occur for several reasons: 1. Power failure: If there has been a power failure, effluent will accumulate in the pump tank or dosing chamber until power is restored. When power is restored, the alarm may come on for a brief period (less then 30 minutes), but will go off as soon as the pump draws the effluent down to the normal level. 2. Pump or float switch failure: If a pump malfunctions, is may quickly be replaced by unscrewing the PVC discharge union and lifting the entire discharge assembly out of the pumping chamber. A malfunctioning float switch may be accessed by removing the entire float tree from the chamber. Make certain that the power supply is off and all cords are disconnected before removing or replacing the pump or float tree assemhhes. 3. Clogged distribution system: If the distribution system becomes clogged (an unlikely event), the pump will run but the tank will not be emptied, Should this occur, system laterals should be flushed (see next section). In general, when power is interrupted or the system's alarm sounds for any reason, water usage in the dwelling should be restricted as much as possible to maximize effluent storage time. ilIORLAN CIVIL ENGINEERING Water - Wastawatm • Cialnage Studies - Grading Plans • Site Development • Soil Testing 504 BROADWAY • JACKSON, CALIFORNIA 95642 - (209) 273.1441 Page 2