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Hi Valmir,
I used a telescope similar to this for over a decade. I certainly wouldn't recommend filters for this apeture. At the end of the day, filters block light in order to increase contrast. I'd only use filters on apetures of 8" or above.
It does have the 1 1/4" focuser though so you should be able to use 1 1/4" filters.
Are you familiar with collimation?
Does the mirror have a centre spot?
In a dark sky you can see quite a bit of detail in the Orion Nebula with this apeture when properly collimated.
Have fun,
Doug
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