Building a fairly large cement pond DIY (+pics soon)

My aunt uses a motion detected water sprayer thing to scare away predators for her pond.

Now that is a slick idea! I'll have to suggest that to my friends who have a pond. Should be pretty easy to set something like that up I would think.
 
We bought a Scarecrow motion activated water sprayer to try and keep racoons out of our pond. All it was good for was "Hey, Mom!! Look! It missed...awwww, now I'm all wet!" and conning friends into coming to look at the pond and getting a faceful of water instead. I watched a racoon sit right there, watch the water shoot by, and then continue trashing the pond. We ended up running a hot wire along the top of the fence to keep them out of the yard...nothing else, including the dog, worked.
 
LOL. Raccoons are a handful. I seasonally volunteer at a wildlife rehab and they're not afraid of anything and are super curious about everything.
 
sweet pond man.. makes me wanna go get my shovel
 
Yah, raccoons are whole other story. The sprayer would likely work a LOT better for birds than for raccoons.
 
I've been meaning on redoing my dad's pond for years. This just may be the year. We haven't put any fish in for a while after raccoons got all of the koi two years in a row.
 
I think it looks very interesting and original. Did you construct forms before pouring cement?
 
Here's a question for Chompers:
How do you bend re-bars for a round shaped pond? And when making a re-bar grid for the shape, how far apart can the re-bars be spaced? Will curing the cement with salt keep the pH stable or will the cement always mess with the pH in the future and salt will need to keep being added? I mean, if you don't coat it with any of those products that you mentioned.
 
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