Just finished filling it and got major problem. Can anyone help?!! When i turn the return pumps on the main tank floods! I have 2 50mm durso drains (one at each end) and 2 40mm returns with a aquamedic eco 9000 pump connected to each. So total volume of 18000 ltrs not including the big sump and the 2 pumps should be pushing 18000 ltrs back to the tank. But they seem to be filling the tank up too quick even though i have the 50mm durso drains opened fully on the ball valves. I can just about get it to run on one pump but as soon as i start the other pump the main tank fills too quickly to the point where it just over flooded! So i have had to shut it all down for now and rethink what is wrong?
New 9x4x2 tank, major problem, can anyone help please?!
- Thread starter jim barry
- Start date
Your pumps are too strong. One pump can barely do the job at say 1000gph, just barely. So when you kick in the next 1000gph pump your WAY overdoing it. You basically need an inbetween size of pump. A 1200gph pump would do the job in this example. Or turn the pumps down if possible.
Throttle the pumps back. If you didn't put valves on the discharge side of the pump, you need to take a trip to the hardware store my friend.
Or do what he said. Sounds easier. I must have lucked out and run my pump at full speed ahead and it does the job perfectly.
If the drains are only just handling the flow of one pump then it seems pretty inefficient to "throttle back" two pumps to just over half their combined capacity.
I can think of two causes of your problem. Either A; your drains aren't big enough for the flow you want to push thru the tank, in which case you should add another drain or try to get one of the existing drains running as a full siphon rather than the durso so it flows more water, or B; the weir that the water flows over isn't wide enough and/or low enough below the top of the tank, in which case therre isn't much you can do short of ripping it out and making a larger one. Pics of the set up would help.
I can think of two causes of your problem. Either A; your drains aren't big enough for the flow you want to push thru the tank, in which case you should add another drain or try to get one of the existing drains running as a full siphon rather than the durso so it flows more water, or B; the weir that the water flows over isn't wide enough and/or low enough below the top of the tank, in which case therre isn't much you can do short of ripping it out and making a larger one. Pics of the set up would help.
