Recent content by ctenophore

I would do the former. Lose the Dart/venturi and put the HH in as a recirc pump. That's how I did mine although the body is considerably bigger than the 25PE (I believe mine in volume compares to their 75). You could use the Dart as the feed pump, it is quieter and more energy efficient than...

They're not currently in production. We are thinking about cutting them in our machine shop rather than outsource them, so if you're interested let me know the time frame and I will schedule it on the project list accordingly. For air intake, I am simply using 1/2" CPVC (5/8" OD) tapped...

Not sure if this is the same place, but a buddy of mine just went to Thailand and got a behind-the-scenes tour of this large clownfish farm: http://www.wamas.org/forums/index.php?showtopic=34493 (scroll down halfway) They are alive and well. Apparently they send many of their 15k/month fish to...

You should try to calculate your actual BTU loss rate. A BTU being heat needed to raise a pound of water 1F. If your 6000 gal system (8.5*6000=51,000 lbs) loses 1F/hr then you need 51k BTU/hr. 1 watt = 3.4 BTU/hr, so you would need 15,000 watts of heat to keep it constant. My suggestion is...

Can you elaborate on this? I've had pretty good luck with the hobby sized UV generators (up to 350 mg/hr). I was looking at Clearwater units on recommendation from somebody else. They are a lot cheaper to run vs. del ozone or ozotech + oxygen concentrator. The UV units need bulb changes just...

I was under the impression that RK2 switched to HDPE over fiberglass since the plastic was ozone resistant for longer. My experience with PVC and acrylic has been pretty good. It won't last forever, but then again it doesn't cost much to build either. You shouldn't need pure oxygen if using a...

I have not heard of that, but to be honest I have never run ozone on any of the prototype or production NW pumps. I suppose it is possible, but I would guess that silicon carbide is ozone safe. The impellers themselves are either molded polycarbonate (Darts, I believe) or Delrin. Both of...

I'm in the process of designing and building an ozone reactor for a 4000g system. I think a specialized ozone reactor is far more efficient than running ozone through a skimmer. My design is 14" diameter PVC pipe, 60" tall, using an atomizing spray nozzle to inject system water. The plan is...

Plug the pump into a kill-a-watt to watch the power draw as you tweak it, that way you will be sure not to burn up the motor. Try to keep it below 140 watts; you should be able to get 110-120 watts by restricting water intake. I'm not sure where they get the 20 scfh claim, but they weren't...

Oops, sorry. I just use a Kill-a-watt and watch the wattage as I adjust the gate valve.

Definitely not dumb questions! We tried the same things :) 1) Yes, I think it does cavitate some- which probably helps small bubble production. That decreased pressure is what helps draw in more air at higher head. Hard to tell exactly what's going on inside without an acrylic gate valve &...

Hi all, I am the developer of the Orca needlewheel, so I will try to give some guidance based on testing we did while developing this impeller. Early on, we thought the piston pump was necessary to get the Dart to draw air at anything beyond about 42" head pressure. The problem with the air...