The biggest negative about filter socks is that they must be changed every 1-4 weeks and washed in bleach. Also, not many spouses/mothers like those bags to be washed in the family washing machine. 

The speed/volume of water coming down the drain line partly determines which method will work best. Other methods I use successfully are:

1- Set a piece of acrylic or glass above the area where the bubbles pop. Salt spray collects on the underside and drips back into the sump. This is by far the easiest method and it can be combined with additional methods below.

2- Attach a length of flexible, thin wall, white bilge tubing (available at HD and Lowes) to the drain line and have it extend down into the water. A curl or loop at some point in the bilge line, usually at the end, sometimes helps if there is room for the loop/curl. Bubbles combine - less foam, less salt spray. As time progresses the growth of algae and bacterial slime on the inside surfaces of the bilge line make this method work better and better.

3- Insert the drain line through a hole in a flat ~5" wide styrofoam piece floating on the water. Bubbles combine and come out from under the styrofoam larger and less messy.

A combination of 1 and 2 are currently used on my main system which also uses a Modified Durso. Feel free to call/text and come over to see it in action.

Aloha,

Mark  

P.S.

- 1" Bilge Tubing fits snug into 1" PVC fittings. 

- A small hole drilled in the drain line above the water line just causes bubbles to come out at another point. It has never worked well for me.

"Floaties" are food for some animals. It's okay to let the sock overflow for a little while or even leave it off from time to time.