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I was waiting for someone to sing praise about the buoy filler version of a garden hose attached to a compressor fitting with an air needle screwed on. This is one of the things I tried BEFORE I came up with the garden sprayer mod. FYI, there are two glaring problems with that method:1) you have to carefully monitor the water flow - with someone on the hose valve - or you can easily overfill the buoy (with water); trying to "yank" the needle out at the right time is not a very precise answer for that problem.2) a garden hose won't inject any air into the ball, meaning you still have to have some sort of air pump handy - meanwhile, the garden sprayer does double duty, since it will also inject just air. The garden sprayer makes it child's play to put the exact same amount of water in each buoy, and works exceptionally well for an air pump - even better than the typical bicycle pump. You can't do either with a garden hose. We use a cheap plastic planter about 6" or 8" diameter at the open end, and rest a buoy in it with the rope-eye down in the planter (this steadies the buoy, so is also an excellent holder for painting buoys). Fill the garden sprayer to a known level, screw shut, then pump 100 - 150 times. Put needle into buoy, pull trigger and lock open. Walk away if you want. After a minute or so the buoy will have the right amount of water AND be inflated with air as well. May have to add (or bleed off) a little air, but that is very quick too.