For the initial BIO-CEL ® types individual membrane cassette configurations and PVC frames were used. With the XL module the PVC frames and cassette configurations were eliminated. Instead, four membrane arrays were integrated into one stainless steel frame. This design change allowed for a significant increase in stability and packing density per module. The resulting XL design success story led MICRODYN-NADIR to offer the smart features of the BIO-CEL ® XL also with a membrane area of 480 m 2 per module.
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