Engineer didn't really know what he was doing on this job, spent 20 minutes saying my filter was broken when the only problem was the protection caps were not removed (in manual) then removed a non return valve as he didn't know what was (states do not remove in bold in the manual) told me it was a very odd fitting to connect piping to water supply (it was just a standard washing machine/dishwasher tap) then proceeded to state the job is very complicated and will have to have a second call out as it will take a few hours- I ended up cancelling this and fitting it all myself in under 90 minutes and at £99 per hour a fraction of the cost, called up to cancel the job and explain why and the operator didn't seem interested in the slightest- all in all an expensive bad decision, think I will stick to friendly local plumbers than through a company from now onwards