Remember that nebula filters only help on emission nebulae. They won't help on star clusters or galaxies. Need to get to dark skies for those.
General "Light Pollution" filters are just broadband nebula filters and frankly pretty useless.
Narrowband UHC type filters give better contrast on most emission nebulae.
Even more narrowband OIII filters have a really dramatic effect on certain diffuse nebulae and planetaries. They blot out too much light for smaller scopes but are OK in my 10 inch.
Not the same thing as going to dark skies but they do make the nebulae more visible in moderate light pollution.
I don't use filters when viewing planets or the moon. Never found that they helped much.
BTW-you'll find these filters are not much cheaper than eyepieces anyway!
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