Hi DB
First of all, they are superbly built, the service from Mactra uk is incredible. they do what they say on the box.. the membraine is industry standard SW35-40 I think (Aint got the spec in front of me) available anywhere - around 100 squids..

Email Jim at Mactra for a list of users who you can contact.

You wont find a unit of the same quality with as low a power consumption.
Hop on a cheap flight to La Coruna and you can take a look lol..

Serious, Give Jim a call.

Mactra UK - Schenker Watermakers