W/D Pump Question

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SCP Pool Supply. Their website is password locked. I don't have an online account so I have to wait till I get down there.
 
Guys, help me out please. I can't raise the waterlevel in the tank any further as it is already filled to the brim. It seems that the overflow is not sucking water out fast enough (the tube connecting two parts seems to be only half full at best). I am trying to approach this from the perspective of simple physics. Unfortunately my knowledge of physics is rudimentary... If I find a way to either raise the sump or lower the overflow, will this shortenning of the distance water has to travel affect the flow? Bottom line is that I need to increase the flow somehow without affecting the amount of water in the tank :confused:
 
Stab;984359; said:
Guys, help me out please. I can't raise the waterlevel in the tank any further as it is already filled to the brim. It seems that the overflow is not sucking water out fast enough (the tube connecting two parts seems to be only half full at best). I am trying to approach this from the perspective of simple physics. Unfortunately my knowledge of physics is rudimentary... If I find a way to either raise the sump or lower the overflow, will this shortenning of the distance water has to travel affect the flow? Bottom line is that I need to increase the flow somehow without affecting the amount of water in the tank :confused:
Click to expand...

Either your overflow is too small, not working right or your pump is too big. What kind of overflow and pump do you have?

The water level should never be higher than the overflow.
 
Stab;984359; said:
Guys, help me out please. I can't raise the waterlevel in the tank any further as it is already filled to the brim. It seems that the overflow is not sucking water out fast enough (the tube connecting two parts seems to be only half full at best). I am trying to approach this from the perspective of simple physics. Unfortunately my knowledge of physics is rudimentary... If I find a way to either raise the sump or lower the overflow, will this shortenning of the distance water has to travel affect the flow? Bottom line is that I need to increase the flow somehow without affecting the amount of water in the tank :confused:
Click to expand...


I can't raise the waterlevel in the tank any further as it is already filled to the brim.
- You dont have to raise the water level in the main tank, just in the sump tank so the pump is fully submerged and not sucking air.


It seems that the overflow is not sucking water out fast enough (the tube connecting two parts seems to be only half full at best).
- the tube connecting the two should be full of water no matter how fast the flow through it. The air in your "U" part of the overflow should have no air in it. This may be the reason that your overflow is "sucking water out fast enough ". But if its not overflowing fast enough for your pump,you would know as your tank would be overflowing onto the floor untill your sump went dry.

If I find a way to either raise the sump or lower the overflow, will this shortenning of the distance water has to travel affect the flow?
- Theres only a certain point to how low your overflow will lower (HOB style).
Raising the sump would decrease the head pressure on the pump and result in a higher flow. What flow rate are you trying to achieve?
 
What kind of overflow / output from the tank do you have set up? This sounds like the problem area.

Is it just a hole drilled in the back of your tank at the surface with PVC piping down to the sump? I have read that if you put a regular 90 degree elbow right at the back of the tank where the water comes out, this will greatly impede water flow. You need to use a 90 "street" elbow here (its a swept 90, not a hard turn 90). However, this may not even be the case since we don't know exactly how your set up is done.

Can you get us some pictures of the setup? Make sure to take pics of everything. It will help us diagnose the problem, plus I always learn some new ideas from seeing what other people have done. Love to see what you did!

Congrats on tackling a DIY project. Sounds like it just needs a little tweaking.

Every time I build something I always come across something I didn't think of, and have to redo the project in some way. It pays off in learning though, so I don't mind my screw ups. You know the saying about learning from our mistakes...... well I have really learned a lot! :WHOA:
 
This is why I got my tank drilled for my sump and it will always start and I use a power head that came with a sponge and I put an elbow pice on the intake instead of the spong to draw water closer to the bottom so there is less chance of air being sucked up when the water level drops due to evaperation. If you can take the bottom part of the pump off and there is a hole where the water gets sucked up do the same as I did and that will solve part of your problem.good luck
 
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