Types of Control Panels, Floats, & Effluent Filters:
There are many different types of time-dosed control panels on the market. The basic function for all of these panels is to effectively allow the pump to deliver effluent to the disposal field at specific set intervals. These set intervals are set to approved design specifications and are set to not allow too much effluent to get dosed to the disposal field. Too much effluent dosing a disposal field (hydraulic overloading) can cause pre-mature failure of the system.
Below are some pictures of typical control panels that you may find installed on a site:
The control panel gets its sensing signals from floats installed in the pump tank. Floats are basically liquid level switches (like a light switch). Usually, there are two to four floats in a pump tank, but usually you will find three. When the liquid level rises or falls to a specific level (depends on float installation), it will send a signal to the control panel that there is or is not enough water to pump (on/off float), there is a high water alarm condition (high level alarm float), or the float and/or pump is "stuck" in the on position (redundant off float). If wired properly, the redundant off float will turn the system off and not allow the pump to deliver any more effluent to the disposal field and it will also protect the pump from damage from potentially being on for a long period of time and overheating.
Below are some basic float types that are commonly used in pump tanks.
Quality effluent filters and pump screens are a great idea and possibly the cheapest "insurance" you can provide for your septic system. Effluent filters are usually installed in the outlet baffle of the septic tank and are installed for easy removal for cleaning. The basic function of a effluent filter is to "filter" the effluent existing the septic tank. Filters are usually either a mesh or slotted in design and the openings are usually 1/8" in size. Usually the filter should be removed and cleaned or inspected yearly.
Pump screens are installed around the effluent pump in a pressure system. The pump screen acts like a filter and help reduce the amount of solids that will get delivered to the disposal field.
Below are some examples of types of effluent filters and pump screens you might see in your system:
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