<a href=showthread.php?s=&postid=11887175#post11887175 target=_blank>Originally posted</a> by Slphappy
Basically, you need more surface area on your closed loop intakes. More surface area = less pressure at the intake. You'll need to add something to increase the surface area such as a piece of PVC pipe with lots and lots of small holes drilled in it. You could even build little snail proof egg crate boxes to cover your existing closed loop intakes. I'm hoping you understand what I'm trying to say here...
Hope this helps...
Good luck