mine goes to landfill from my bin, anyway I just empty it then I have a great funnel that fits exactly into the hole and has a big wide filling area, I got it from daqua but I can't see it on his site. and I use a food scoop that you get in a pet shop for scooping dry food and the like, and I fill it up to the neck, then fill with water and fit it back in, very little mess and really quick, an alternative to the funnel is a down pipe hopper I think they are called from B&Q and the like, just make sure it fits in the hole