Neptune Aquatics

Sedra 3500 question

A_Lee

A_Lee

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Today I cleaned my skimmer pump. I've been using this pump for a little under one year now.
I happen to also have a spare Sedra 3500 lying around. I took a glance at the each of the intake pieces on each of the pumps, and the intake hole is larger on one than the other. Apparently the pump with the smaller intake hole is the one I've been using thus far. So I tried both intake pieces on my skimmer. The smaller one doesn't draw NEARLY the same amount of water as the larger one. I am afraid to use the larger one because I am not sure that if by drawing more water into the skimmer, I will be messing up the air:water ratio. Any insight? I definitely want top performance from my skimmer. FWIW, it is an ER RS-80.
Also, I just noticed some bubbles leaking from area where the intake cover attaches to the pump body. Not a terrible amount. Will this affect skimmer performance? I am thinking it has always been doing this, I just never noticed because my sum area is pretty dimly lit. All the parts are in place, and I took it off and put it back on multiple times. Still some bubbles. Thoughts on this as well?
 
I'm sorry for not being clear about that Jeremy. I meant water intake. The air intake on both are the same.
The aperture on the water intakes pieces are different though.
 
I'd imagine (I'm not a physicist though), the the smaller holed volute is designed for a shorter skimmer with a wider neck, less head pressure is being pumped, so an increase in the venturi effect can be achieved (more bubbles) due to not having the pump work that hard. The larger hole is for a taller skimmer with a smaller neck where you need more water pressure to fill the body and the skimmer relies on dwell time.

Then again one could be a Euro-Reef design and the other a Sedra :D.

Physicists? You wanna have at it, I'm probably misinforming Ant here :D
 
haha. Thanks for your thoughts on that Jeremy, really. I was pretty stumped, so any feedback is great for me! :D
FWIW, the spare Sedra 3500 pump I have came from someone who was using it on an ER RS-80 as well.
 
aero-hydro-dynamics? Sorry not my specialty :D

In all honesty I understand the effect of what's happening, fast moving fluid is creating a lower pressure zone allowing the air to get pulled in, but all the mechanics of what happens beyond that or designing, well that's an engineering problem... DUDLEY!!! :D
 
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