I have my ball valve after the return pump. To me it makes more sense since you won't be restricting the flow of water to the pump itself.
I would put a ball valve on both the return and drain. This would allow to cut off the water from draining and also from the pump during times of maint for the sump.
But you can dial in the amoun of flow you want from the sump and also amount of water going to the tank til they equal themselves out so your not getting too much flow or too much drain.
I will place the valve after the pump, thanks guys!
Good job on your project so far and your DIY sump Mr. Tan. I have some suggestions for you.
I like your sump baffles. Glass is better I've heard cause it makes a stronger bond if you are using silicon to mount them as opposed to using acrylic. Just one suggestion about the height of the first bubble trap. The height shouldn't be higher than the output from the skimmer. The skimmer should be allowed to empty from its drain piping without water blocking it. You could lower the baffles or just raise the skimmer by sitting it on top of something.
To answer your previous question, ball valves should only be used on the output of any pump to restrict the flow. Restricting the flow on the input side will stress the pump. You can plumb in a ball valve or better yet a true union ball valve, on the input side, but only use it when the pump is off and/or when doing maintenance on the pump.
Another suggestion is you may not want to use the pump externally for a few reasons. Having the pump have to suck water out of the sump through any size pipe is going to reduce the overall flow quite considerably. Also only using 1/2'' pipe and having an elbow before the input will reduce flow even more. The input to an external pump should be straight tubing and should be horizontal. You will be surprised on how little flow is produced.
How big are the overflow drain holes and what size tank do you have?
thanks!
I was back and forth with glass and acrylic, but when I found a place locally thanks to my dads help that can cut glass and it ended up being cheap i was sold on it. Especially because of hearing how much better it bonds compared to acrylic which the silicone would just be more of a wedge. I do plan on using a egg crate stand to raise the skimmer so the output is above water level, i just didn't get to that part of the build yet! thanks for the reminder though!
That was my biggest concern so far, i couldn't figure it out. I thought maybe it should be after so it doest cut back on water flow to the pump, but again i didn't know... I will be sure to put it after the output of the return pump and not before.
This part now is kind of a bummer to hear haha (although i appreciate the input from you)...I would really like to the keep the return pump external, mostly for ease of maintanence and also because i dont want the excess heat in the sump because my tank already runs warm and I dont want it any warmer. I did purchase a return pump that was stronger then what I probably needed, even at a 7' head height it says it should be able to pump over 300 GPH , and my overflow is a up to 75 gallon tank (or 300 GPH overflow). I got something a bit bigger for my tank because i am planning to eventually upgrade and I will carry this over to the new tank.... Do you think it is still ok to use it the way it is? i mean, if I don't really even need to adjust the ball valve for return flow?
I am using 3/4" tubing, i decided to go with that instead of 1/5" to help with more flow. Now I have a question for you. My overflow box uses a 1" drain tubing, can I step it down to be only 3/4" to equal out to what my return tubing to the tank is going to be? or should I keep it 1" and do that size piping all the way down to the sump?....
My tank is a 29 gallon and the sump is a 20 long