Need help with Return Pump

You can depending on the situation. Instead of running a pipe vertically down and then using a 90 to turn horizontal like this _|, you could use a 45 and run the piping like this /. If that made sense.

My point exactly

For example this is something I did on my system. I used two 45s instead of two 90s.



 
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If we use the HD 100 pump in the calculator and put 4' vertical height with 1"D PVC with 2 90's we get a flow of 1756gph vs 1772gph with 2 45's so we gained 16gph. Do that a few times and it will add up. Another option would be long 90's. You can see I got to the same place with the PVC without using 90's or using 4 45's.
 
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Very interesting. Using a bunch of the suggestions I found a way to quiet it down.

First I removed 2 90s. By doing this I also replaced some of the PVC on the return to flexible tubing and put a silicon heating pad down. I still have the Mag 18 hooked up and have it turned down again and it is super quiet.

As for the overflow box I took the suggestion of using one stand pipe as an emergency and set it up higher in the overflow (so it only is used if the water in the HOB overflow raises). I built a Hofer Gurgle Buster for the other drain and it completely silenced the drains. All I hear now is the sound of gently flowing water over the baffle of the overflow box.
 
Also in terms of the 90s vs 45s I may be able to remove 1 90 but the rest have to stay as the pipe goes through a hole drilled level in a partition wall (tank on one side, sump/fuge on the other).
 
I don't know if I would use a Quiet One pump as I read a few reviews of these pumps catching on fire.
 
Those mag pumps run hot and wattage is high. I have a couple still running and trying to phase them out.

Bought a few jebao dc products and dosing pump with no complaints yet. The jebao dcs return pump might be something to check out. So cheap buy two of them and always have a back up.
 
Mag pumps are crap. I hear dc pumps are the way to go. Jebao pumps look good. I have a rio 2100 , rio 1700, and a quiet one 4000 which are working great and they're quiet. I've heard a lot of trash talking about rios but I've never had a problem with them

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I've had my Jebao DC 12000 running for 1.5 years now. No issues at all. Very very quiet, and obviously you can control the flow rate. Thumbs up from me.

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the mag drive 18 is a noisy pump unless it has absolutely no head pressure and does require you to use 1 1/2 return line. this will make some quieter but dialing it back with a ball valve will make it only louder.. I have one i use on my mixing station because of this.

any good brand pump as mentioned above will suit you well. just be careful to not over power that over the top over flow box..
 
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