Gravel vac info, please

My pond is still under construction, but will be 8' diameter and 2' deep. I saw one advertised as a pond vac that uses a garden hose to provide the suction. Apparently it uses the hose water for suction but doesn't put any hose water into the pond(?) to keep from adding chlorinated water. It looked alot like a shop vac with a floor tool head on the end of the hose. My yard is surrounded by big old firs and they drip needles EVERYWHERE....
My dad has a 23x16' Koi Pond and he uses a fish net over the pond when the pines are dropping, and again when the oaks flower. The rest he lets rot in the pond (the Koi love it I guess)?

Have you asked in the cold water section?
 
Nope, asked in the pond section and then here.

I will net for the fir cones and sticks, and keep an eye on the needle situation. I know what pH is, but what is kH?

Thanks again, everyone, for the help.
Jen
 
Pond section was what I was after ;)

I tried to find the net my dad uses, but it captures all of the needles, and small male pine cones as well as the little oak flowers. It is very fine and since he started using it, he loves it.

P.S. It also keeps the Great Blue Herons and Hawks away! :)
 
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