Octopus Skimmer Mods

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<a href=showthread.php?s=&postid=7927580#post7927580 target=_blank>Originally posted</a> by wjhuie
Anyone done the recirulation mod on the nw200? My new nw 200 and nw150 will be here 8/15 and I am going to buy a oceanruner 3700 and do the recir mod on the nw200 and use the otp3000 to run the nw150.
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Interested in this too. I might go a step further and try to run it externally (although sitting in a plastic bin). So who has done the recirc mod on the Nw200? How big is the fitting on the venturi of the pump? Could it be made to seal TIGHTLY with a uniseal? I'm tempted to give making an NW200 into an external recirc model since the RPS-3000 is way too tall for my stand.
 
The thing that bothered me the most about the gate valve mod is that for a quick visual referance it is not possible to see the exact water level in the neck so......a short piece of 3/16" thinwall a lighter and 2 minutes later.......

<a href="http://www.flickr.com/photos/58279226@N00/216101600/" title="Photo Sharing"><img src="http://static.flickr.com/64/216101600_7889e87e41_b.jpg" width="1024" height="766" alt="DSCN1087" /></a>

May not be a big deal for some but, I like to crank the valve down a full turn or so right before I stick my hands in the tank to super wet skim whats in the neck and this way I can reset the level just right without waiting for the head to build again or guessing if it was a full turn, 3/4 turn whatever, you get the idea.
 
<a href=showthread.php?s=&postid=7929412#post7929412 target=_blank>Originally posted</a> by Roland Jacques
I did some grinding, dermel style in side the volute impeller housing area. I rounded of the output hole and did a little sanding (very little sanding). It improved air flow about 20%. Their is not much material to work with in their I was very surprised to see that much improvement. The volute is very thin.

This with the 90 elbow mod has increase the air 60% from where it was when I started. on the NW-200
The photos are not that good. I am probably going to sand it some more to polish it up some.

26018P1050887.JPG

26018P1050885.JPG
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Roland, just wait till you see the air when you replace that whole area with 1" PVC. (I need to get my camera working again)
 
I just got my nw 200 and nw 150 today. I ordered it from Marine Solutions It was shipped out regular ground on monday and arrived today wed at 9:00 awesome They both look great but I hate the cross brace in the nw 200. I was thinking of cutting it out. Does every nw 200 have the cross brace? I also have ordered a gen x 4100 nw I plan on adding to the nw 200. I plan on using the otp 3000 on the nw 150. What do you guys think?
 
<a href=showthread.php?s=&postid=7950956#post7950956 target=_blank>Originally posted</a> by wjhuie
I just got my nw 200 and nw 150 today. I ordered it from Marine Solutions It was shipped out regular ground on monday and arrived today wed at 9:00 awesome They both look great but I hate the cross brace in the nw 200. I was thinking of cutting it out. Does every nw 200 have the cross brace? I also have ordered a gen x 4100 nw I plan on adding to the nw 200. I plan on using the otp 3000 on the nw 150. What do you guys think?
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I wonder where they are getting this older style NW-200 at?

I have no clue as to how you would remove the brace or the 90? Do you have photos? The brace would not bother me at all; in fact I think it could possible help a little in minimizing turbulence. The 90 is pretty restrictive the tees much better IMO, the 90 in the body may be a deal killer for me. If I was going to keep it I would at least take a 12" drill bit and drill a 1/4" hole in the 90 that would relieve most of the back pressure. I drilled smaller holes in my tee mainly to disperse air/water with a little less turbulence it worked good and I think relieved a little backpressure also.

why do you want to change the pumps???

26018P1050891.JPG
 
NW-200 short venturi mod

NW-200 short venturi mod

I was trying to clean up the little clear tube that the airline attaches to and I drilled too far so it is now opened up all the way to the intake. I then put it back on the pump and noticed no difference. I then decided to drill the other way (horizontal, from where the washer would be if I used one) to meet the vertical hole and again drilled all the way through the venturi. I put it back on again and besides making more noise, I did not see any difference in performance.

Do you see any problem with this or should I try to order a replacement venturi. I guess I could always try to plug the holes to return it to the original configuration.

I've been running this for a week now on a 120 with 100 lbs of uncured rock and it is not really pulling out anything. The rock was pretty clean for being uncured and has not even showed an ammonia spike yet so maybe there is not anything to pull out.
 
Mirror pond, on the NW200, the biggest restriction is the elbow on the pump. Until you open that up some, venturi tweaks wont make a big difference.
 
I'm having a hard time figuring out what you actually did to it. Drilling through it vertically should be plugged up, but not sure about horizontal, where it would be coming out.
 
I first drilled straight down through the rigid tube all the way through the opening. I then drilled horizontally out through the front. I now has two holes that it did not have before.
 
<a href=showthread.php?s=&postid=7952187#post7952187 target=_blank>Originally posted</a> by Mirror Pond
I first drilled straight down through the rigid tube all the way through the opening. I then drilled horizontally out through the front. I now has two holes that it did not have before.
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thats kind of funny, you messed up once, so then you messed up again? No more drilling for you, step away from the tools :lol: kind of like me and spelling.
im kind of suprised it works with the hole in the front. you might try to fill the holes with epoxy or even thickend pvc glue the hole in the front would be my concern.
 
<a href=showthread.php?s=&postid=7952732#post7952732 target=_blank>Originally posted</a> by Roland Jacques
thats kind of funny, you messed up once, so then you messed up again? No more drilling for you, step away from the tools :lol: kind of like me and spelling.
im kind of suprised it works with the hole in the front. you might try to fill the holes with epoxy or even thickend pvc glue the hole in the front would be my concern.
Click to expand...

Just one of those days:rolleye1: Funny thing is, it seems to be operating exactly the same as before the holes. I think that I'll plug them anyway just in case.
 
Okay, heres what I'm running now

Venturi:
71024IMGP0520.JPG


Venturi2:
71024IMGP0522.JPG


And the big one, removed the whole top part of the front of the pump, replaced it with 1" pipe, attached a union, and epoxied everything in.
71024IMGP0525.JPG


I seem to be stuck at 22 SCFH though. I think I'm maxed without making some more major changes, but its skimming so well that I dont think it matters.

On an interesting note, I knocked the pump off the body, and running in my sump, it was pulling 33-37 SCFH!!!!!!!!. I want to see if I can pull that by recirc modding that.
 
Mine has the elbow I am thinking of drilling a big hole in the elbow oppsite the opening of the elbow. do you think that will work?
 
So show us a picture of it drawing air and working :D

That like me saying I got my ehiem 1260 on my RPS-3000 and not showing it running ;)
 
<a href=showthread.php?s=&postid=7958360#post7958360 target=_blank>Originally posted</a> by clkwrk
So show us a picture of it drawing air and working :D
Click to expand...

You people are so damn demanding its ridiculous....


when I get home :-P
 
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