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Pond water!?...

Too many micro organisms built up when grow inside with it...no good...

Pond water sits...has tons of life in it...

Grow on ponds edge and watch out....boom
 
Hard tap water isnt a biggie for most soil grows. I do it all the time. Hydro, different story. Personally, I would go with tap water unless im pretty sure there is no chance of nasty runoff getting into that pond.
 
I've been using rainwater-only for the last ten years or so and haven't had any issues with it. It's just distilled water, produced by nature, with a hint of carbonic acid picked up from our atmosphere on its way down- bringing it down to a ph of about 5.6.
For something like DWC or even DTW hydro using a reservoir you may want to stay away from the pond water because of increased slime/root rot type organisms present in a pond. I can't see any other reason to avoid it.
If its ph is that close to neutral then there's a good chance the ppm is low as well and that it doesn't contain high mineral levels. Not that this factor really applies at all to the original question of tap water vs pond. Worth checking the ppm or getting a sample tested- but you'd know if the water had toxic mineral levels- by smell, appearance, and the plants growing in and around it.
Keep in mind that almost all people on these forums are urbanites and tend to completely freak out at the thought of any sort of mysterious 'wild' biology invading their grow.
 
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PH it on every use. Make sure there is no chemical, pesticide, herbicide, runoff in pond. Sometimes people spray herbicide in pond to keep aquatic plants from taking over the pond.
 
Just an update. So my friend is using pond water. And so far pretty good results. He has a little problem with on of the plants. It was a PH problem though. He has been using apple cider vinegar to ph down. I wish I could get some pics to show you. Maybe soon!

Thanks for the help!
 
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