Problems with Durso Standpipe

[Jurupari Man]

I've just set up a 270g tank, which is drilled in the bottom - two 1.5" drains, two 1" returns. Plumbed to a LifeReef sump. I've got Durso standpipes on the drains, and I'm still getting a lot of noise.

I started by drilling a 1/16" hole in the end cap of the Dursos, but the water level in the overflow boxes dropped low, and I got the awful loud sucking sound. So I drilled the holes bigger, and the water level came up. But I still have a sucking gurgling noise coming through the holes in the tops of the Dursos. The bigger I drill the holes, the higher the water level gets in the overflows, but the louder the sucking noise gets.

Please help. The tank is in the living room, and I was hoping it would be MUCH less noisy than this.

[frosty]

Man, I just installed mine and they are silent, I believe I used 5/64 holes. What size PVC did you use. I plus sized mine like the website reccomended. Used 1" on the 3/4" drain, and 1-1/4" on the 1" drain.

Also, is the noise in the overflow or the sump?

[Jurupari Man]

It's 1.5" PVC on a 1.5" drain (Rich Durso actually recommends same size pipe on drains 1.5" and up I believe). The noise is a sucking noise coming from the standpipe. Of course there is some splashing in the sump, but that is enclosed in the cabinetry so isn't as noticeable. I am going to have a canopy made for the tank which should help considerably.

[slipknottin]

Keep messing with it... Thats about all the advice I can give.

You could also try a piece of airline coming out the hole and using one of those air valves to control the flow.

Dont know, I never got my tank quiet either, but Ive seen other tanks with Durso's and they didnt make a sound.