How would you build a big pond?

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Oompa Loompa

Polypterus
MFK Member
Feb 6, 2016
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Let's hope T TLkmDN chimes in here, he's pretty experienced with this :D

I'm wondering how you would go about building a large concrete pond, like the one TLkmDN's got. My understanding is this:

You want to first (obviously) dig the hole wherever you want the pond, whatever shape it's going to be. You'll then put chicken wire and/or rebar down, then get the concrete poured on and let that set, and you've got the basic frame of the pond. OR, you could use cinder blocks to fill in the frame and then cement over them. After that, you can put a liner (like linoleum tiles) down and/or paint it with Pond Shield or a similar epoxy paint. After that you've got a pretty basic pond form.

After that you've gotta get filtration worked out. I guess before you put everything up, you want to plumb in grated drains to lead into either the floor or side walls. Where can I find a plumbing schematic for a pond like this? After that it will go into a sump, which will be a big long deep tub built the same way as the pond's frame, and you add in baffles too. After that you want a few big submersible pumps to pump the water back through returns in the walls of the pond.

For media in the sump, would you go with something like filter pads and sponges first, then a baffle, then some more filter pads and large bags of bio-media, then even more bio-media, and then a return section, also including a couple of huge UV sterilizers?

Also, how would you heat a large pond like this (something a little under 20,000 gallons)? Can you over filter a pond? Should there be surface skimmers? What kind of turnover would you want?

Thank you!
 
Thanks, registered and there is a thread up now. What would be a better filtration system, a big concrete sump or 3 big 6000gph sand filters, UV sterilizer, and a 300 gallon stock tank made into a filter? Talking about a 25,000 gallon pond

How would this be heated? Running a 400,000 BTU heater on a 25,000 gallon pond would cost 43 grand a year. Could a smaller heater be run? Obviously it isn't needed for the entirety of the year, I live in NC
 
Dig hole. Pond liner. Fill up with water. Easy as pie. Helped with two ponds. You can add rocks and such after leak test
 
If/when I do this, I'm leaning towards a concrete pond though like TLkmDN's . I've seen ones with liners and ones made from concrete and I like the concrete ones way better because you can actually see the fish.
 
If the stock list were to be:
-2 RTC, 1 TSN/RTC hybrid, 1 TSN
-1 paroon shark
-1 niger cat
-3 Pbass
-10 or so common plecos
-1 pima
-1 SAL (south american lungfish)
-1 giant gourami
-2 indo dats
-1 tarpon
-4 aros (jardini, blue/black, and 2 silver)
-2 alligator gars
-2 clown knives
-1 FRT
-2 red belly pacu
-1 bowfin
, what would you feed them? Would something like Keystone Pellets be a good all around pellet food? Should I feed bass pellets, HiPro pellets, or pond pellets? Pond pellets are 78 cents per pound and 35% protein, Hi Pro pellets are 45% protein and $1.16 per pound, and Bass Pellets are 48% protein and cost $1.23 per pound. Anyone feed anything other than that, preferably something cheaper?

Obviously pellets aren't the only thing that needs to be fed, would a mixture of assorted freshwater fish (mostly panfish that were caught, frozen, thawed, and then fed; also something like silversides), night crawlers, shrimp, and then fruits and vegetables work for a good all-around mixture for everything? (obviously the herbivorous fish would get more of the fruits, vegetables, and some pellets versus the fish and vise versa).
 
Bump.

Is there any way to insulate the concrete for the pond? I am planning to cover it with a portable tent during the winter, and just temporarily seal it off at the bottom. Then use propane heaters in the air, plus some huge submersible heaters (either 1000 or 6000 watts) year round to keep everything stable. Oh, anything on the feeding? And is the stocking OK? Is the pond generously large? Could it be smaller?
 
Having built many koi ponds in the past my advise is to do your homework, and some. My suggestion is that you use 1 or 2 pool pumps and not submersables. Also plump a waste pipe into your sump to flush waste. Never use pool sand filters as fish waste clog them in no time. There are no hard and fast rules as many pond builders have their own method of building a pond. Find one that works for you. Most importantly, never skimp on filtration. It will bite you in the a.....Good luck!
 
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