I accept "Mersilon" more than two years. All arranges. As often it is necessary to change...

[Ayr]

I accept "Mersilon" more than two years. All arranges. How often it is necessary to change OK? And whether it is necessary?

[Ayr]

Has not absolutely understood. It is necessary to change OK every year or in general to do or make a break in reception? Whether Have appeared OK sovreshennee Mersilona? What do you think about "Logeste"?
Thanks