dosmatic microdos 2.5

[ericst11]

I bought this dosmatic Microdos 2.5% and was wondering if someone had used one or could explain what the 2.5% means . I had it set at 1.1 ratio and i thought it would use 1 gallon of concentrate to 100 gallons of water but it seems to use more and i'm wondering if maybe the 2.5% means it is a different ratio even when set on 1.1. If someone could help it would be greatly appreciated.
thank you