Wes, do you have any links for the pumps with the seal system you describe? Are they available for a similar price in a size that would suit the homebrewer? A lot of ppl seem to be using the march pumps ... sanitising would be an issue but hopefully its not too bad.
GMK. how is the IDRA for cleaning? Do you just run hot water through it as everyone else seems too. Ultimately I will hopefully build some kind of HERMS system so the pump would have to handle lengthy runs at higher temp. May have to give it some serious thought as it is about 20% of the cost of the march pump ... the extra capital could go toward refurbishing the keg taps

or on a
PLC for the automated brewery phase