Modified Durso question

[bayareaquarist]

So I made this durso and Im having some issues. I used 1" fittings and schedule 40 -i think- slim pipe...This pipe has a wall thickness that is slightly thinner than regular PVC. -maybe 2-3cm?









It seems to be creating back pressure and surging every 60-90 seconds...At times the water level in the overflow will just surge once and then level out just below the 90...The downpipe into my bubble-box is submerged less than 3" from the water level and Im running a Mag 7 w/ 1/2" return line...The air feed is fitted with an air-tight valve and the riser is adjustable...I cant seem to dial it in. Any thoughts??

 

[TNTREEF]

take out the green valve on top. drill two .25" holes on either side of the tee-fitting.

 

[bobbyblank]

Those valves are terrible. The only way to use them is to drill the inside out to get more air flow. I had to enlarge the I.D. on my old air valve and still couldnt get enough air flow through it to stop the surges. I just use an open hole where the air valve is and adjust my return ball valve. Hope this helps.

 

[matttaylor]

^ times 3. If there isn't enough air flow through the top of the durso it won't work.

 

[jeweldamsel]

Too many air holes may become noisy as well. I would dril one at a time.

 

[Matt_Wandell]

It will also help to place a gate valve on the drain line and dial it down so only a small amount of air is getting sucked in. Reduces the noise considerably.

 

[bayareaquarist]

Well me, Pete and Bobby figured it out...Did just about everything mentioned~! Its nice and quite right now so Im happy~!

Thanks for the sugestions guys~~!

 

[bobbyblank]

Glad its going good now, thanks for the polyps.

 

[bayareaquarist]

No problem man~! Hope she enjoys them~!