RO membranes are same but ...

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RO membranes are same but pretreatment  approach is a bit different. Pretreatment system is designed to remove completely all scale forming impurities dissolved in water  as well the feed water pH is alkaline so that silica scaling is prevented on membrane when operating at high PH.  Very careful selection of pretreatment process , operation and monitoring is critical to the sucess of the HERO process.  All the advantages of high recovery with HERO process is nullified with waste water from pretreatment regeneration -ex- water softners, dealkalisers etc. HERO process is outdated. Now RO process technologies have changed with new disruptive RO process technologies it is possible to reach as high as 98% recovery .