Snad filters would require much more pressure than foam, floss, or carbon filters, so I guess it would depend on what filter type it would be used for. Also, did you push the water into the bucket, or pull it out? Pulling it out would create a vacuum in the bucket, helping to seal it, as compared to pushing it water in and creating a positive pressure inside, blowing the seal outward and being less efficient on top of that. Glad that someone has tried that, though. What size pump were you using? Might have to rethink that lid, if it bowed out that much from being pressurized.... Hmm...