Raising water level height in rimless tank

[Canuck007]

Hi,

Just finishing up my plumbing on my 150 rimless tank that is eurobraced all the way around. Going with herbie overflow.

The weir in the overflow comes about 2" down below the top of the tank. I don't want my water level to be that low. I'm assuming the water level will be at the height of the overflow correct?

So do I just put some pieces of acrylic on each side of the overflow maybe about 1 inch high so that keeps the water in the tank 1" higher? Hope I'm making sense...

thanks!

[WiDataTech]

That should work just fine. I'd probably just put it on the inside of the box.

[Canuck007]

hey thanks for the input. i was thinking of holding the acrylic with a plastic screw and nut to hold it place that way I could still raise it and lower it if I wanted.

[Reeferfourlife]

Are you talking about the bottom of th teeth on weir to be 2 inch from top of glass?

[Canuck007]

yes. the teeth go down about 2" from the top of the glass. so I figured my water level would be about 2 inches below the top which to me feels like it will be too low and showing the water line.

[Reeferfourlife]

The water will be about 1/2 inch above the bottom of teeth when you run your pump.

[DrPheel]

you can also raise your stand pipe a bit and it will raise the overall volume instead of baffling the overflow teeth

[mr9iron]

Or you could restrict the flow of the gate valve a bit more which would raise the display level. This may affect the surface skimming though.


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[Canuck007]

i thought about that. the only thing is i'm going to do the herbie method so the one standpipe will be about 6 inches lower than the emergency so I'm thinking blocking part of the weir is the only way.

[mr9iron]

Originally Posted by Canuck007

i thought about that. the only thing is i'm going to do the herbie method so the one standpipe will be about 6 inches lower than the emergency so I'm thinking blocking part of the weir is the only way.

Well, give it a shot and see what happens. Let us know how it goes!

[billdogg]

Using acrylic pieces to block part of it will work well. To be able to adjust it to where you will want it, just hold the pieces in place with a couple spring clamps, figure out exactly where you like it, mark their positions, remove the clamps and use a little Weldon 4 or 16 to fasten them in place. (16 is gel - will be easier to work with)

[Mark426]

Bigger return pump or close the valve on the overflow slightly.

[Darth_Tater]

The closer your flow rate gets to the maximum the overflow can handle the higher above the bottom of the teeth the water level will be. I can't run my return pump more than about 3/4 of capacity or my water level in the tank is too high. So if you can increase the flow rate that should increase the water level (as Mark eluded to).

[JMorris271]

I have the same situation that you do. My tank came with an adjustable plate on the inside of the overflow and I could slide it up or down at my pleasure. I ended up removing it completely and run my water level about an inch from the top of the teeth in the middle with no problems. My siphon drain is about 7 inches down below the surface. The emergency drains are 1/2 inch above the teeth and keep any overflows at bay in complete harmony. My level in this shot is a little low but you get the idea. . T hat reducer on the ED is not normally there. I was just testing something out.

20151017_150126.jpg

[Canuck007]

thanks jmorris. so does it just stay at the 1 inch mark below the teeth automatically for you since you took out the adjustable plate for the overflow? how far down do your teeth go below the top of the tank?

i was assuming the water level would come down to about the top of the teeth on my tank and that is about 2". too low for my me.

[JMorris271]

The level is controlled by what you set your valves at. It stays where you set it as long as the balance is skewed.

[Canuck007]

so the valve that's on the main drain? i have a gate valve on the main drain for restriction to get the siphon.

once siphon is achieved the water level will stay at a certain height correct? i guess i'm wondering if that height will be too low or not?

[JMorris271]

you can tweak any or all until you get your desired level. Make sure your sump can handle your settings as you may have to add some volume to the sump. Its easy to get too much water in the sump to achieve what you are want.

[homer1475]

All rimless tanks have the water level roughly an inch to 2 below the top. If you didn't want to see the waterline, you shouldn't have bought a rimless tank.

ON a side note, covering up the teeth on your weir will effect surface skimming, and cause a lot of water crashing noise from it dropping so far to the drains. It will accomplish what your trying to do though. You could also just raise the e-drain so your water level is where you want it.

My rimless tank has the water level about an inch below the top. I got it that way by adjusting the e-drain.

[Canuck007]

i guess if i had known that the water line would be that much below i probably wouldn't have bought it. i just thought you could raise it pretty easily.

also the weir would only be partially covered so yes there still would be surface skimming. if the weir is 2 inches deep and you cover 1 inch water will still drain through the slots and get surface skimming.

i'll try adjusting the e-drain and see what that does. that might be the easiest thing to do.

[MattGatten]

Try raising the flow (power) on your return pump and see if you can tweak it to an acceptable level. Keep and eye on your sump. Make sure it can hold all the return water when you shut the pump off too.