Ok, guys, since Brutuz is one of "those people", we need to use some Vulcan logic in the no pump in pond argument. I don't advocate having any pumps inside the pond, unless its a prop pump
Here are my top 10 reasons for your consideration....
- Clogging - Not talking about river-dance here. When you have the pump in the pond sucking up the gunk, its gonna clog. No matter how big of solids it will pull, something will clog it. Ever seen a frog get stuck in a pump. With our pumps on the end of the circut, they are alway pumping clean water, no chance of clogging. What happens when it clogs during the middle of the night, and your pump and filter are down until you discover it? Can a botom drain clog? Sure, but the item has to be thin enough to get in before it can clog up a 4" pipe. You might get a peice of something stuck on one side of the drain, but the rest of the drain remains open, still pulling water.
- Macerated Poop -Makes it harder to remove from system.
- Macerated Fish - Fish go in bottom drains occasionally, for whatever reason they pop the lid off or one is small enough. They wind up in the settling chamber and are returned safely to the pond. Your submersible pump is going to destroy that fish. Also see Clogging above.
- Fish Injury - Do you really want something else in your pond with a potential sharp edge that the koi are going to rub up against and get a possible wound on themselves?
- Electrical Consumption - How efficient is this pump you are wanting to use in comparison to say a Sequence or a WLim. Most sump pumps can't even compare.
- Electrical Hazard - GFI it all you want, are you sure its safe?
- Noise - Submersible pumps are noisy in the water. Don't ask me to prove it, but the submersible pumps I have used (mag drive) seem to bug the fish sounds wise.
- Flow & Design Options - In a gravity feed pump, the pump can do whatever we want with the water after it goes through the filter. Trickle tower, waterfall, TPR, etc. We can work with pressure on the back end.
With your pump to filter situation, your filter location will will be limited in where the water can go afterward because it will have to be gravity fed back to the pond. No TPR - Cleaning & Maintenance - If you want to clean pads, thats up to you, But I like just opening and closing a valve to clean my filter. Macerated poop, harder to remove.
- In your way plumbing- Ive dealt with this with retro fit over the liner bottom drains....You'll have a pump, cord, and pipe all visible in your pond and in your way anytime you want to catch a fish. Sure, you could pull the pump when you want to do this, but not having to sure makes life easier.
Feel free to add to the list anyone... Oh yeah #11...
Your Primary Concern Leak Hazzard "The winters in New England are damn cold..and a pipe could crack very easily if not installed perfectly."
What senario is more likely to happen...
Bottom drain: For some unexpected reason, Bottom drain starts leaking one day just out of the blue? As if, but ok, say it happened, ground shifted, rodent, earthquake, pipe froze and broke, etc... Best case senario, its a drip drip drip, into clay soil and you don't even notice it. Worst case its a big hole in sandy soil and all the water soaks into the ground overnight....
Submersible Pump: Same situation, something happens to the pipe that your pump is pumping through...Froze and broke, or say Your Filter Matts clog, and your pump runs over the filter and pumps your pond dry in whatever GPH it runs.... How many have heard this one before "a racoon knocked my pump hose out of my filter and it pumped my pond dry"