Rainwater system 37 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 MEDIO - ASPRI 15/4 is equipped with an ESPA ASPRI 15/4 pump. The ERCU MEDIO LOAD - GXR/RM9 - ASPRI 15/4 is equipped with an ESPA ASPRI 15/4 pump and a Calpeda GXR/RM9 submersible pump as the advance pump. The ERCU MEDIO F - METASMALL is equipped with a frequency controlled Calpeda METASMALL pump. The ERCU MEDIO F LOAD - GXR/RM9 - METASMALL is equipped with a frequency controlled Calpeda METASMALL pump and a Calpeda GXR/RM9 submersible pump as the advance pump.