NEW Tank Build !!!

[lastlight]

I always put the gate valve at the pipe's end before it enters the sump chamber. it needs to control the sihpon properly and because the water throughout the pipe is pulling downwards I think it has to be at the sump.

[Aqua-Digital]

Ok so what I have learned is this

drain 1 Durso style with balancing gate valve at sump?
drain 2 = open acts as overflow

You balance drain 1 until it stops sucking in air and drain 2 takes the excess water?

[lastlight]

you don't need dursos really. the full siphon can just be thru bulkhead. i tune the flow so it just barely trickles into the secondary standpipe. You make the standpipe / emergency drain taller to raise the water level in the overflow box and make it as quiet as possible.

[Aqua-Digital]

so the emergency also allows you to balance the height of the water in the tank?

[lastlight]

the height of water in the overflow box. the standpipe/emergency should still be a bit lower than the overflow weir / cutout so you don't raise the display's levels.

[Aqua-Digital]

my cut outs give too much gap between euro brace and water height thats why I asked, instead of closing off the depth of the teeth I thought it would be easier just to raise the standpipe?

I need to raise the tank level basically

[lastlight]

i guess you could but would that scenario skim the surface as well? i'd personally silicone a strip of glass inside the overflow to raise it up a little. it could be glued behind the existing teeth.