There is an air bubble because your aerated water from the sink is feeding it bubbles 🤦🏻‍♂️

Your silencer is upside down, the clear acrylic tube is supposed to be up in the air, not down in the bulkhead.

in 2:19 you mentioned the tilting motion of the internal box... that tilting motion is for people that don't have a 100% leveled tank and need to adjust the leveling on the box to get even water flow.using a rubber gasket, rubber Washer or a drop of acrylic solvent cement once you have it set to the perfect level. in 3:07 you showed us the Foam insert for the "back Box" and the noise reduction tube... I agree with you about NOT using the tube but I have the foam insert on to pick up any "Large Trash" and instead of cleaning my sump's filter once a week, I clean out that foam every night about 10 minutes after feeding the fish and and before the filters turn back on. in 5:50 you mentioned that you had trouble with priming the U-Tube for the back box... You should be able to remove at least 75% of the air from the tube with the airline tubing. what I do to get it 100% is get it going with the airline tubing in the U-Tube and once the water starts flowing it will push the air bubble to the opening of the airline tube where you will be able to suck it out OR just stick the overflow boxes unto your tank sideways until the two boxes "AND the U-Tube are full" , straiten them out and lift them out of the water and the back box, the internal box and the tube will be filled and the tube WILL be primed 100% ;) The only problems I've had with those types of boxes are simple fixed problems. The first is that the back boxes on most of them don't give you enough space to place two U-Tubes into it and the second problem would be that the internal box's baffle is not open all the way up to the top to empty the tank if you get too much water flowing into the tank all at once. but in case of Emergency I don't have to worry because I had enough problems with those boxes that I (NOW) have two overflow boxes in every tank so that I never have to worry about the tubes getting clogged

Do not put oil any where near plastic it will cause it to perish and go brittle use ptfe plastic safe lubricant.

If shake the tube it will get rid of the air bubble no need to drill.

I am using this PF 300, I usually just shake side to side up and down to get the air bubble out, it works great with my 75 gallon tank.

I also fitted a bleed valve with a tap in the top of ubend if you send the bleed tube into the exiting water on outside of overflow box it pulls the air out perminently without using an aqualifter

you can easily remove air in the pipe by lowering water level and then pouring a lot of water all at once into one section. This forces a large rush of water thru the pipe and flushes out the air. Much easier than sucking out air from a tube.

I agree only one wing nut come on man: but..... overall that joint looks nice and solid I agree again. Thanks for sharing I can’t wait to hear the full review.

It won't work testing it like that it needs the pressure of the tank volume and works on how much return flow from sump I have this and a don't have thd air lock in u pipe

I agree with oiling the nut to adjust the level. I got the 1000

Once you have the black box adjusted to proper height, lay a thin bead of super glue on the top, similar to a bead of caulk.

GREAT review! Thank you, I completely understood everything you said!

PF 800 has two wing nuts !

I have a 1800 I used for a few months, double tube style of course. My complaint is that no matter what I did I could NEVER keep air from building up in the siphon tubes. ( the water flow into the intake box causing at least some bubbles, adjusting that box did not help at all) After a some months of using it I determined there is no way I can TRUST it not to break siphon on me, a potential to cause a disaster! So I removed it and reconfigured my whole aquarium set up.

So I have on of these overflows but do not have that piece of pipe to quite it down. What exactly is it? can I make one?

I need your help, I have a 30 gallon setup (26 gallon main tank and 7 gallon sump) I have a 370GPH return.... Can you let me know if I should get the PF-300 or the PF-800? Really appreciate the help as i am thoroughly confused

looks good👌

How did you silence this monster? It is loud!

This was very helpful. Thank you!

What is this for? I am a newbie wanting to start and hide a filter. Its just a 10 gallon tank in corner of kitchen and i want o do a saltwater reef. I like things tidy. I dont want things hanging out. I am painting back black and thought of buying a hagger I thik, it called its submersible and has a spray bar and doubles as a powerhead, so (tidy) would blend in with black background.. I thought of buying a used one with a stand and could put a canister. I saw some clear pipes. Can I use clear pipes and tubing. Just anyway to keep things tidy. I don't know if I need a skimmer, i heard someone say that nanos relied on water changes so not necessary. I also heard of a HOB refugium. I have a 2inch space behind the 10 gallon thats painted black. Should I get a refugium, or maybe later down the road since I am such a newbie, and i think he had a skimmer in a refugium, so maybe I would have to change water once a week. Thanks for any advise

What’s the purpose of the acrylic pipes that are glued to the pvc? Mine broke off not sure how important they are

never used one before looks neat

Glue rubber drawer stops at each end . Don’t glue the overflow box to itself .

Thanks for the video. Did you ever do the video with the tank and sump?

OMG do not drill the U pipe .......................... read the instructions, you will void the warranty, just place air line tube up the pipe and suck.

What’s the max flow rate it can handle

Definitely looks 100 times better than a traditional overflow weir and gives you more room in the tank!

Here is the solution for the air bubble instead of drilling the tube. kzfaq.info/get/bejne/rKqCjNV-y9ureqM.html

Would you recommend just making one of these on your own, rather than spend the money?

Your wing nut is on the wrong side. I did the same thing at first.

I think you have the screw backwards, don't you? I doubt the head of the screw is supposed to be against the aquarium. Harder to adjust that way. Also, if it was me, I'd definitely use that sponge. The more surface area for beneficial bacteria the better, right? Having said all that, I'm not even really sure what an overflow box is, so take everything I said with a grain of salt.

Looks like fun ahead can't wait...🐠🐠🤙🤙

The kitchen sink is causing the bubbles

Do you have a video on how you added the air line? Did you use silicone to attach it?

Cool I hope you show it when is your tank,, thanks for sharing

The bubble wouldn’t go away because the faucet was creating bubbles

Good points. Thanks for this video super helpful.

I think they over price for this box

Put it in corner. Can’t be moved then by fish hitting it

Nice video!

Nice!

Cuanta agua desperdicias, que nefasto!

Add airline tube first to suck up the air. Don't drill it. It ugly 😂

Won't buy this one.

Eshopps instructions are garbage