I have to apologize... I am a total idiot at the end of a long day. After a good night's sleep, I realized I made a terrible error in my formula (see above). The time it takes to fill a gallon is NOT DIVIDED by 60, but rather MULTIPLIED by 60. I didn't realize what I had written until I tested the flow of my 40B awhile ago, and tried to use the screwed up formula. It took 24 seconds to fill a gallon, or just over 2 gallons per minute. I didn't think 30 gallons an hour sounded right, and once I realized my mistake, it came out to a little over 120 GPH. This is only 3 turnovers per hour (120/40=3), but I tested it with the pump on the basement floor. Once it is installed in the refugium, this will reduce the head by more than two feet. I hope it makes enough difference so I don't have to buy a bigger pump.
Here are some pics of my latest plumbing job. It's some of my best work, so I'm a little proud of myself:
I know...
right? Not everyone can create such a masterpiece from so little! LOL!!!
Actually, it was a temporary setup so I could test the flow, and most
importantly, how much drainage there would be in the event of a power outage. I am adding the 40B to the refugium along with my 125G and RDSB, and it gets pretty full during power outages, so I tested to make sure there was no overflow. The check-valve on pump line and the inverted home made P-trap in the drain (first picture) did it's job, and I was pleasantly surprised when I had 2 1/2 quarts of drainage after killing the pump. Woot!!!
Lol that's an awesome setup! Looks like something I do hehe, but, if it works that's what counts!