5 gal skimmer build (built)

musty baby

New member
Wasn't really dedicated enough to this project to follow it through with taking pictures, etc, so instead of a build thread this is more of a "built" thread.

Have wanted to build my own skimmer for a long time and decided to use a 5 gal water jug as many others have in the past. Went with 4 mesh-modded genX 1500 pumps because: 1) I had already had good luck meshmodding them for modded seaclone skimmers, 2) already had two sitting around, and 3) the four combined are cheaper, use less power, and push more water (potentially pull more air) than 2 of the GenX 2400 NW pumps. I did put in 3/4" plumbing with extra space rather than the required 1/2" in case I do desire to go with bigger pumps (I don't think I will).

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The skimmer is gravity fed from my display's overflow and ultimately leaves the skimmer through a 1.5" pvc extension patch. It can be raised and lowered to adjust the water level in the skimmer at any time. A 4" to 3" pvc adapter functions as the skimmer neck and is directly siliconed to the skimmer body. A short length of 3" pvc is siliconed into the collection cup. The riser tube will be taller than what you see in the pictures, I just left it short so I could get a feel for water level adjustment and how tall it should ultimately be. I may go to a new collection cup and a 4" riser neck since it seems to me that I simply have too much air coming through that small area. I'm going to let it run for a couple days before I decide.

When I first got it going, I hadn't thought of the induction noise from the airlines. It sounded like the entire room was full of 5 year olds trying to suck the last drop out their cups with a straw. I had to leave the immediate area to hear what others were trying to tell me. So I built a silencer like the ones everyone recommends (airline into a container, polyester stuffing or the like, tube out of container) but built a much bigger one out of 1.25" pvc. It was still loud, so I built another. On this one I used a 1" version of my first silencer inside another 2" chamber. Cut the noise a lot, but it's still not as quiet as I'd like it to be. I might try again.

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What I have yet to do:

Cut grooves in the collection cup tube to fit orings and be sure I'm getting a tight seal with the skimmer neck.

Increase the size of the skimmer neck to 4", I really feel like the 3" is too small for the amount of air running through it.

Increase the size of the intake tube to at least 1". I was in a pinch to get things plumbed when I moved and couldn't find a 1" barb fitting at Lowe's, so the overflow has a 3/4" output and it's simply not enough to keep up with the small return pump.

Overall this was fairly easy to build. I don't think it would be possible to build a free-standing skimmer out of a 5 gal jug, it's just too brittle and likes to crack around the uniseals when inserting pvc (which takes a lot of force, if you've never worked with uniseals.)

Anyway, that's been my project for the last couple days (should have just up and finished it months ago.) Thought I'd share it and see if anyone had any suggestions since it's going to have to be taken out of the sump a few more times.
 
Interesting. I also tried a silencer made out of a standard black film container. It didn't seem to do much. I may have to biggie size it like yours and see if it helps.
 
<a href=showthread.php?s=&postid=10853811#post10853811 target=_blank>Originally posted</a> by tinytool
Awesome DIY skills

Nah, I'm a halfassed craftsman! The entire thing was built with a 1.25" hole saw, a dremel tool, and a .25" drill bit! ;) It mostly just took time, but thank you very much for the kind words.

I'm liking the skimmate it's pulling right now. I readjusted the water level this morning and got a full collection cup (granted, it's really small right now because of the short riser) of skimmate colored like really strong tea. I might just stick with the 3" riser for a while, at least.
 
Let me get the quirks worked out :)

I'm actually getting more foam production by turning off one of the pumps, so I'm going to go to the 4" neck after all. If that's slightly too big I will restrict the pump intakes to pull a bit more air.
 
Now this is my kind of skimmer! Nice job.

What the budget at on this?

When I buy a house I have dreams of a dart driven 55G drum skimmer
 
Budget? Hadn't really thought of it.

7 for the jug
7 for the collection cup
There's so little pvc pipe it's effectively free
2.16 for 8 3/4" x 1/2"mpt pieces
1.12 for 4 3/4" 90s
95.96 for 4 GX1500s
Effectively nothing for the mesh
8.37 for the pvc expansion coupling
18.27 for 9 3/4" uniseals
3.21 for the 1.5" uniseal

$143 and change, but I already had 2 pumps and all pvc but the expansion coupling.
 
<a href=showthread.php?s=&postid=10858536#post10858536 target=_blank>Originally posted</a> by waverz
So let's see some skimate!!!

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There's a couple days' worth. Collection cup is almost 9" in diameter, so it looks deceptively empty:) Still waiting on a new bulkhead to come in the mail so I can route 100% of my overflow through the skimmer (maybe 1/3 of the overflow output is running through the skimmer right now) and I decided to hold off on widening the skimmer neck since I like the skimmate it's putting out already.

Dwyer airflow meter says I'm pulling 6-7 scfh per pump. I'm not impressed. Next step will be restricting the recirc pump intakes (as easy as pvc caps and drill bits) and figuring out what size intake opening gives me the best air draw. Then I'll probably have to replace the skimmer neck.
 
<a href=showthread.php?s=&postid=10984829#post10984829 target=_blank>Originally posted</a> by ipiniowa
That really pulls a lot out.

Have you thought about putting an overflow valve in the skimmate cup?

Yes, but the collection cup alone has right at a half gallon capacity. I figure if I need more than that I'm getting really lazy about my tank maintenance. Also, if my skimmer ever goes nuts I don't want the water exiting the system and pumps running dry/chaeto drying up. .
 
looks great and looks like it works great! maybe im missing it, but what make the collection cup removable? and and you still satisfied with the smaller gen-x's or would you go bigger?

thanks,.
 
The riser neck is plain ol' 3" PVC and simply slides into the 4"x3" pvc adapter at the top of the skimmer body. My original thought was that this might be a problem with sealing completely and I'd have to fit the setup with an oring for proper seal, but so far the pvc pipe and reducer seal great and I'm not having to worry about it.

I'm pretty satisfied with the smaller gen-x pumps, but had I not already had them I'd have opted for two bigger pumps just for ease of tuning. It can sometimes be difficult to get a single pump going exactly as you want, let alone 4. It works great, though, and definitely looks nice :)
 
You'd have to ask someone else about leaking uniseals or refer to that gigantic 5 gal jug skimmer thread. I intended to put mine in the sump and expected to have them all leak a bit.
 
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