![]() |
#19
|
|||||
|
|||||
![]() Kien brings up some really good points. My sumps have always been designed in a way that the water height where the overflow enters the sump doesn't fluctuate. I don't use socks either, I use a filter pad. I've always had my overflow under water in the sump.
I do occasionally adjust mine, maybe once every few weeks I have to dial it open a bit because I'm getting too much down the emergency, and it never fails that a few days later the main drain with the gate valve starts sucking air. I'm sure it's just a gob of something sitting on top of the gate valve. I know on my system, the gate valve is barely open at all. It seems like it's turned open a lot just by the number of turns, but when I remove it and look (it has a union above it) it's only open a fraction of the pipe diameter. Maybe that has something to do with it - that's been on a constant on my Herbie-plumbed tanks. Quote:
![]() |