john, t, cloudy dhw???

what are in your opinions the causes for cloudy water. im aware of the calcium bicarb turning into carb creating carbon dioxide in the process and hence all the milky bubbles.

are there any other contributing factors ie taps?, pipework? water hardness etc etc

ive fitted 5 of the same boilers (exact make/model) in a few weeks and only 1 giving the milky bubblyness, which is a bit off putting for the customer/user.

picking ya brains and experience--every days a school day unless your a teacher and on strike/holiday/training day/stress related leave..............