Rainwater tank cleaning system with pipe having closed end and inflow openings near base of tank, to flush out sediment during tank overflow

摘要

A rainwater cleaning system for a water tank comprises a pipe means having a closed end (12) located on the floor of the tank. The pipe means also has an open end connectable to an outflow pipe from the tank. Located nearer the closed end of the pipe rather than the open end of the pipe means is at least one hole (10, 10a). The cross sectional area of the hole preferably at least equals the cross sectional area of the pipe outflow. The pipe means also has an outlet (3) covered with mesh (17) so as to prevent siphoning. Sediment is stated to be cleared from the tank bottom when the tank overflows.