I have a tiny leak right above the outlet in the filter. . What can I use to seal it? I assume I want to seal on inside
Is this leak a hole in the plastic housing? Does water jet out or ooze out when the pump is running and the filter is pressurized? Can you post a pic so we can see the size and location of the leak?
Do you have a picture?
In my opinion, the leak is due to a crack developing from the inside. My recommendation is to replace it.
How old is the filter?
What's the highest filter pressure you have ever had on the filter?
You have a very strong pump. If you're running the pump anywhere near full speed, you're overstressing the filter.