The problems with PCHE's are exactly as you describe. The channels are so small ie 1mm deep x 2mm wide MAXIMUM that they are very susceptable to fouling and subsequently extremely difficult to clean succesfully.
As described in the earlier response if you have already noticed increase in DeltaP...
Have you considered Plate & Shell technology? Much more efficient than tubular with or without spiral baffles - approx 25 - 30% of the size. Fully welded plate pack within a shell
Try www.vahterus.com
email duty to vahterus.uk@vahterus.com
