Rainwater system 270 liter tank with automatic switch to tap water for supplying gardens, washing machines, toilets... according to standards EN 1717 cat. AB. Very reliable, designed for easy use and installation. Belgaqua approved. The ERCU MEGA F LOAD - GXR/RM13 - MXS 507 is equipped with a frequency controlled CALDPEDA MXS 507 pump in the tank and a Calpeda GXR/RM13 submersible pump as the advance pump. The ERCU MEGA F LOAD - GXR/RM13 - MXS 505 is equipped with a frequency controlled CALDPEDA MXS 505 pump in the tank and a Calpeda GXR/RM13 submersible pump as the advance pump. The ERCU MEGA 2 F LOAD - GXR/RM13 - METASMALL is equipped with two frequency controlled Calpeda METASMALL pumps and a Calpeda GXR/RM13 submersible pump as the advance pump.