FIGURE 8a)
No water use in house-the ball valve does not seal, and all effluent returning from the sand filter returns to the pump chamber.

Figure 8b)
When water use in house begins, the combined volume of water returning from the sand filter and septic tank effluent floats the ball and seals the recirculating valve.

Figure 8c)
Water now rises inside the return pipe and flows out the riser tubes. In addition 1/5th of the flow goes through the bypass tube,allowing this flow to the leachfield.