Thanks a lot Alex yeah mate a lot of thought gone into set up. A couple of small mistakes. Like the set up I had originally planned had a balance line. I am now going to run two separate lines. Main stream and then skimmer line. So one of my pumps is to powerful. I could ball valve it down. But ain't taking a chance with not being there all time, I had a 14000 pump for one of the lines. So I am now going to run my 12000 on the main bottom drain line which is my nexus drum to upper pond. And buy a 8000 pump to take place of 14000 pump. For skimmer line to return lines in bottom of pond. I will keep the 14000 as spare.best fred