Overflow suggestions

[outdoorworld_70]

I have a 30g with a 20g sump was just wondering if i could use a eshopps 800 overflow with a mag 3 pump or should i buy the eshopps 300?

[ethuman]

Mag 3 should be fine. There is an adjustment for height on the over flow box so just play with that a little bit. The over flow will only drain the amount of water being returned to the tank

[ReefNomad]

If you're worried about losing siphon due to an undersized pump, it's really cheap to add a continuous-siphon mod to an eshopps overflow tube. Get self-tapping 1/4" slip adapters for the top of the tube, use 1"4" air line to run it to a Tom's Aqualifter pump, and run the return from the pump to the rear side of the overflow.

This won't boost your flow rate, all it does is keep the tube full of water rather than running with a large air pocket in it. It also makes restarting the overflow an automated process in the case of power loss...

[outdoorworld_70]

thanks for the help! i'll probably end up going with the 800 as i would like to upgrade to a bigger tank in the future anyway

[sde1500]

I would go with the 800. It definitely can't do the states GPH. It's the one I use and wish I had done a bigger one. I made a modified standpipe to quiet the drain. Pics of it on my build thread.

[outdoorworld_70]

will do thanks. also are you using a 1inch drain and 1inch return pipping?

[sde1500]

Yes

[on the spot]

Originally Posted by outdoorworld_70

...wondering if i could use a eshopps 800 overflow with a mag 3 pump or should i buy the eshopps 300?

I'd get the model with the widest weir for better surface skimming. I'd also look for the smallest diameter U tube - water will move faster through a smaller tube, so less bubbles trapped.

and speaking of surface skimming - if you can get the internal box without those 1" teeth cut that's a win.

HTH

[Vinny Kreyling]

As stated above -- the secret to keeping bubbles from forming @ the top of the "U" tube
is enough flow to carry them out of the tube.

[sailplanes2]

I've been happy with the CS90 overflow on my 30G and only had a small flood once when the air line to the aqualifter got clogged.

If you do go with an air line to the overflo mod, or with CS 90 series, would recommend a black airline tubing.

https://www.marinedepot.com/CPR_CS90...FIOFEB-vi.html

[sde1500]

Adding a pump is adding one more place to fail. I've run the EShopps almost 2 years with zero issues. Never fails to start after power out. Use a gate valve on your return to fine tune flow and make sure bubbles go through the U-Tube and you'll never have a problem. No need to modify anything. Don't fix what isn't broken.