Head pressure is the difference between the water level you are pumping from and the water level you are pumping to. If you are pumping out of your tank and back into it, the head pressure is 0.Head pressure doesn't effect a canisters circulation pump being a closed loop but the head pressure could make the seals leak.
It's a closed loop, but the pump still has to push the water up the other side. So, are you saying it's like an elevator where the motor has to be strong enough move the car but the counterweight means that the motor doesn't have to lift the whole weight?Head pressure doesn't effect a canisters circulation pump being a closed loop but the head pressure could make the seals leak.
Exactly true. The elevator and pump only have to overcome the friction of the system.It's a closed loop, but the pump still has to push the water up the other side. So, are you saying it's like an elevator where the motor has to be strong enough move the car but the counterweight means that the motor doesn't have to lift the whole weight?
Think of it like a hose that you're siphoning water out of the tank with, but once the hose is filled up, you put its outlet back in the tank as well, with the hose entirely full. Nothing happens to the water in the tube because it doesn't lose energy by flowing into the inlet. The only difference is that this siphon hose has a box in the middle filled with filter media. It still doesn't siphon because there is nowhere for the water to fall to.It's a closed loop, but the pump still has to push the water up the other side. So, are you saying it's like an elevator where the motor has to be strong enough move the car but the counterweight means that the motor doesn't have to lift the whole weight?
It looks like this is correct the Eheim 2260 max is 12 feet plus so the 2262 should be even greater but they did not list the stat, also the Fluval FX5 max is 10.8 feet so it can be done.An eheim 2262? but I would recommend a sump with a small pond pump.
this is very intriguing someone in my local club has something like this and swears by it, though the difference is minimal he liks it and water changes are rare unless he wants to do them, I would also add a sump is the way to go, with more than one return pump, you don't want a pump failing without a backup at that head, just have the second work with a float switch where it turns on when water hits a certain level, flotec has a utility pump very similar to what I am suggesting and can handle the head.thanks for the response. The sump idea actually dawned on me while I was at a LFS checking out reef tanks. I might even plant the sump "tank" and put it on an opposing lighting cycle to even out ph and oxygen level changes. What do you think?