Product review (1 stars): Check the o-rings for cracks and brittleness
Leaked when used due to a damaged/dry rotted large o-ring. Very disappointed since I went with this filter because of the lack of reviews mentioning leaking. Many others have those complaints; this one didn't until now. Approximately a fifth to a quarter of the large o-ring was "dry" and riddled in cracks. The o-ring from the old filter was clearly of higher quality and still very supple, so I transferred it to the new filter and now there are no leaks. I will be paying attention to the o-rings on the next two filters when it comes time to use them.

*Update: Leaking reappeared within a day, so I transferred the smaller o-ring over as well. Mostly stopped the leaking, but still get a drop occasionally after a week of being in place. Disappointed.