At STIEBEL ELTRON, we offer replacement cartridges for our 4 stage and 3 stage filtration systems. The red cartridge is designed to filter out sediments, rust, heavy metals, mud and particles greater than 1 micron in size. The yellow cartridge is designed to filter out bad taste, odours, chlorine and particles greater than 0.5 micron in size. The purple cartridge is designed
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