I have a pondvac 3 and it works great! It is pricey but worth it to me as is empties itself AS you continue vacuuming! So, no having to stop and empty it. Cuts way down on the time it takes to clean.
I looked it up again and noticed it is recommended for vacuuming only 2 feet deep. I use mine in 3 feet and it works fine. But if I remember, your pond, DrDave, is deeper??
I have a Muck Vac that runs by connecting it to a garden hose. I don't use it too often because it is kind of cumbersome. The extension hose that it comes with is not that long so after vacuuming for about 3 minutes you are walking around in a bunch of water.
I am not sure that it would be good on small rocks like that.... there is an attachment that looks like the one on a vacuum that goes down into or beside the cushions on a couch. It would probably keep rocks out but may get them suctioned onto it. I guess you need someone that has used it on rocks of that size.
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