Slight leak on filter may actually be coming from a hose connection, look VERY carefully, I recently thought I had the same issue - ended up being a hose connection....
Any leak that just drips once every 30 seconds or so on a pipe is really not a problem - if you imagine how many drips are in your pool, it would take a lifetime to empty the pool!
Many times, the drips like that end up coming to a stop after a while since the minerals in the water will eventually block the tiny opening.