Tropical Fish Keeping - Aquarium fish care and resources

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aandon 10-20-2006 01:50 AM

What pump to buy?
I am looking for a pump capable of putting out water at a high velocity out of a sprinkler head (small opening). I have tried several with disappointing, droopy results because most aquarium pumps are stopped dead in their tracks by any sort of resistance, even if they claim to be able to push a high volume of water. Any ideas where I can find what I am looking for? Thanks

Lupin 10-22-2006 06:23 PM

I will bump this so others will be able to see this thread since advices had not been posted here.:)

caferacermike 10-22-2006 06:29 PM

I think you might have troubles finding one that will work from a hobbyist aspect. Most impeller pumps will not generate pressure like you want. They are meant for volume. Volume and pressure do not mean the same thing. It would help if we knew the application, sizes of tubing preferred, anything else would help. Is the pump mounted below the tank? How much head pressure is invloved?

What type of sprinkler are you referring?

Staright out of highscholl I ran crews of irrigation sprinkler installers. I worked with lawn and commercial irrigation for 2 years.

I've been doing commercial and industrial over head fire protection for 10 years. Those sprinklers are completely different.

Basically you'll need to maintain a minimum of 40PSI at a constant to get a trickle from either. Veined impellers won't cut it.

aandon 10-23-2006 03:42 AM

I am building a custom tank for raising crab larvae. They're obviously small and slow swimmers so I had to design a filtration system that wouldn't suck them up. Basically, i'm trying to make a high velocity laminar flow across the filtration area so they don't get sucked into the filtration. I am trying to use one of those sprinkler heads that shoots a radial sheet of spray in 360 degrees at once. It looks like the pressure I get out of a garden hose is just enough pressure, but I'm just not sure where to find a pump that is dedicated to providing pressure (at least 60 psi to be exact). Thanks for your suggestions

trreherd 10-23-2006 02:39 PM

y do you want to raise crab larvae do you want to sell them?

aandon 10-23-2006 04:51 PM

no, not selling them. I'm doing some graduate research on invasive crab species. At the moment raising the larvae is extremely tedious because we have to change the water by hand (literally sucking up each larvae and transferring them to a fresh tank of water every other day). I'm trying to design a self-sustaining system so we don't have to go through this to change the water.

caferacermike 10-23-2006 07:24 PM

What about adding some sort of layered plastic sheeting to the bottom of the tank like they do at the clam farms? The crabs will seek shelter between the layers and the water will be easy to change out?

aandon 10-23-2006 07:38 PM

yeah, good idea. we do something similar at the moment: we put a bright light at one end of the tank which attracts the larvae and then we can move them en masse. however, they don't all do what they're supposed to, so inevitably there are still a bunch randomly strewn about the tank

caferacermike 10-23-2006 08:55 PM

OK here's another bad idea from a friend that works at the University of Texas doing fish mating and relationship behavioral patterns. They use a cheese cloth like material strotched acrossed a wooden screen. The screen only barely fis into the tank. They push the screen to the bottom, trapping all young under it. This frees up the top portion of the tanks for water changes. Was told to me by my friend Dianne that's how her and her colleagues do it. You could find the same material used for brine shrimp nets.

aandon 10-24-2006 02:53 AM

sweet, that's actually a really good idea. i will definitely give it a shot. thanks for your help

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