But the problem i have only one field that i use for HTML editor. So i need to without stripped tags.
Is it possible not to strip tags only for one field using with input_filters?
No, that is not possible (directly). The security class only passes values to these functions, so they are not aware of the variable name.
The only option would be to extend the Security class and write your own filter method.
Having said that, you should better use input validation on your forms, so users can only enter what they should. And FuelPHP encodes everything on output, so any HTML that will be entered will be harmless upon display. Because of this, I hardly ever see the need for an input filter.