If you are trying to close the valves such that the input to to tank is exactly the same as the output down the drain, that is a flood risk because you don't have an emergency drain. Why not increase the flow out of the pump? Seems like it's no different that valving the drains, but you're wanting more flow anyway.īe very careful playing with the balance between the pump and the drains. Was yours ridiculously loud when you first set it up too? Hopefully it'll work, since it's the same box. Going to let them cure overnight, and give it a go when I get up. So I just cut both of the drains, and put ball valves on them. If you're getting a lot of noise from the teeth of the weir, you might need to dial up your return pump a little and increase the flow of the overflow. Get it so that the water level in the overflow box is JUST below the top of the little pipe but well above the larger diameter pipe. Put a valve on the drain from the overflow and dial it down a little. Otherwise, dial it to what's required by the tank setup. If you have the return pump where you need it for filtration and sump equipment, leave it alone. Have the pipe insert so that the small, glued in piece is facing up. Take the foam filter out of the overflow. I have the same overflow and here's what I did. Thank you for your help! If you have any other suggestions, I welcome them. I've never heard a tank run as loud as this one is. I really don't know what I'm doing wrong. I'm going to let it cure overnight, then go at it again tomorrow. I just pulled the box off, and cut the pipes, and put a ball valve on each drain. I did flip the "bells" on the Hofers as you suggested, and it did quiet it down some more, but it's still fairly noisy. Because yes, definitely don't need a flood, to your point. That first video I just popped the elbows on real quick to make it, normally I suck all of the air out of there. Once I get it in, I'll get the water all the way to where it needs to be. The water level in the tank is a bit low right now, because I have 200 lbs of live rock coming tomorrow, so I wanted to leave space for displacement. Haha, yeah you're right! But I'm having the opposite problem at the moment I have the pump on the lowest setting, and it's still outpacing the overflow, which is why I'm not getting this whole thing. It might get better if you revise your design. I believe the water should enter the hofer from underneath, the holes being underwater is why it's quiet. That's why you can't run these way slower than recommended, air will collect and break the siphon. The tank side of the tube must be underwater so it isn't sucking air and the water must be moving fast enough to push any little bubbles that get in out the other end. You cannot have bubbles collecting like that. The amount of air in the tube in your first vid is very bad. Unless you drain and drill the tank, you're stuck with some variation on a box and this is one of the better ones. I don't think it's too fast tho, I think you just need to play with it some more. you forgot about gravity head loss reduces pump power by a lot. By the numbers it shouldn't be an issue at all. I'm running it on the lowest setting so, in theory, 320 gph. My pump has a max of 3200 gph, and ten power increments.
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