Durso standpipe help

[Mike7744]

I built a short durso standpipe for my eshopps PF800 overflow.
I'm having some trouble, I can't get a good flow rate. I am currently using the Hofer Gurgle Buster, and i can get 800 gph on that but it's noisy. What can I do to the durso to get 800 gph. It should be able to handle that am I right? Not sure if the hole i have drilled in the top is to small or to big.
It's just under 1/8".
Any suggestions are appreciated.

 

[Kingsley_Reef]

What size is that 3/4 pvc?

 

[Mike7744]

What size is that 3/4 pvc?

1" pvc

 

[eggie]

Maybe try opening the hole more and pass a 1/4 od tubing x 6-8 inches long till it breaks the internal bubble.

 

[Mike7744]

Maybe try opening the hole more and pass a 1/4 od tubing x 6-8 inches long till it breaks the internal bubble.

Ok thanks, ill give it a try