please help guys.

[ryan]

i just connected the Rio hyperflow 32hf to replace my weak extrema.

the output stated on the box is 8000l/h. i thought maybe its not exactly there so just give it a shot lah.

i conencted everything and switched it on, the maintank almost overflowed!

the durso pipe could not support the increase in the flow. 25mm durso can only handle 2500 L/h of flow?

anyway is there anything i can do now? to increase the flow to the sump?

drill the airhole of the durso bigger? cut off the durso pipe so water will just flow down?

please help guys!

asap too... my tank is return pumpless till i find a new pump or a solution.

[roidan]

if your pump is too powerful, playing around with the airhole may not help much..

either u get add an I-box to your system, overflow PVC pipe system that some have DIYed here, or cut off the durso at the standpipe...but that will mean you will get a very noisy ###### sound as the water drains itself....

but i also wonder if an open end standpipe of 25mm can drain fast enough for your pump

perhaps you should use back your extrema while u slowly think of the options available

[weileong]

Reduce the size of the air hole on the dunso. This is provided your overflow box can take the increased flow. Bigger air hole = lower flow and smaller air hole = higher flow. No air hole = max flow (full siphoning effect).

However please note that when the dunso just starts up it will take some time for it to reach it's max flow (depending on size of the air hole). During that time the water level in your overflow box will rise and this is very normal. I believe this is what you are seeing now. Observe carefully let it run for a while see if the water level will drop or not.

[roidan]

yeah, if by covering the airhole to get the full siphon effect still cannot solve the problem, then cutting the standpipe will make no difference since both are at full possible downflow already...

the next step would be adding ibox or DIY PVC pipe overflow

[strat]

If possible, use a ball-valve to control the output from the pump.

Worse case, sell the pump off and get a lower output pump.

[ryan]

ok thanks guys...

i will go cover the air hole and see if it works...

[ryan]

oh man...

it doesn't work...

still too much water in main tank...

if i don't cut off the pump the maintank will overflow...

i guess i have to find other solutions...

anymore suggestions?

will the ball valve work?

but that would be inefficient as the pump wattage is 120w and if i use ballvalve i should just get a slower pump...

[roidan]

unless you can find alternative uses for the pump..means using the pump for the return and other stuff like chiller? skimmer? or other equipment...then you can share the flow

or use a smaller pump as suggested also

[vincegoh]

U can try to reduce the height of your durso pipe. Since the volume of flow increase with the diameter of pipe constant, u will need the hydraulic head to increase so that an equilibrium can be achieved. As to how much lower, u will have to trial and error.

Make sure that your outlet of your durso pipe is not restricted.

Hope that it helps.

[riot]

Are you running a injection system like an AquaC? I t off mine to run my chiiler/ return plus ev120. Works fine.

[ryan]

yeah i am using aquaC ev120 too...

and pac qoo chiller.

however i have decided to see if i can change both pipes in my overflow box to durso pipes that lead to the sump. and have an external pipe from the pump to return flow back to maintank...

but since my overflow box is so small...

i'm gonna have a hard time sawing the pipe down...

[vincegoh]

yeah i am using aquaC ev120 too...

and pac qoo chiller.

however i have decided to see if i can change both pipes in my overflow box to durso pipes that lead to the sump. and have an external pipe from the pump to return flow back to maintank...

but since my overflow box is so small...

i'm gonna have a hard time sawing the pipe down...

Pretty good idea as well.

Good luck