Posted: 09/06/2014 at 19:53
You can indeed get them - some fish like koi are very fussy and their ponds are kept clear of debris with vacuums like this. They're not as bad as they sound and normally collect the waste into a bag which you can leave by the pond for any bugs to get back in. Also they recirculate the pond water so you don't need to worry about contamination.
I've never used on Daniel, you might be better off asking a forum more targeted to fish keeping.