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As Greg has already asked...is the glass you removed the internal (bluish) filter? or another layer of glass.
If it's just the original filter then I wouldn't worry about moisture etc.
This filter element is the one usually removed in the DSLR -increased Ha response mod.
I've been living without any filters for the past four years with no issue.
Re filters
The Hutec LPS would work as the Uv-IR cut, as well as light pollution rejection. You colour balance will obviously shift due to the filter.
Can't really comment re DSO - I only do spectroscopy.
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