It is a 5 year replacement cycle, and is a Hybrid OAT (OAT with Silicates).
G12+ or an eco-friendly G13 that replaced it that is not as good performance (lower boiling and higher freezing point).
You are supposed to use de-ionised water with it - I used one of these..
http://www.aliexpress.com/item/LCD-D...2-006b0fdd6de9
and used brita filtered water which was ~60 vs. 190 out of the tap.