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Blackeagle · 09-10-2003, 06:47 AM

From what I've read about use of the Larger Iwaki pumps I have one suggestion for you.

Don't reduce the line size, until you absolutly MUST. Smaller lines will waste much of the larger pump's power. And don't reduce it at all going from the res to the intake. If you restrict the intake you may get cavitation, and that would be the end of quiet. A 3/4" female threaded fitting with a 1" tube size going to the res would be even better. Keeping the inlet in lowest resistence flood at all times will give you:
1) better flow
2) lower noise
3) less pump wear.

edit:

Sence87,

Good point regarding the water noise.

And I believe you are correct regarding the Iwaki letter designations. Listings for barbed ones at US aquarium sites seem pretty rare, so I forgot that part.

2nd edit,

Would not the much increased pressure of the Iwaki MD-30RLZT also increase the water sound a good deal?

09-10-2003, 06:47 AM	#6
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	From what I've read about use of the Larger Iwaki pumps I have one suggestion for you. Don't reduce the line size, until you absolutly MUST. Smaller lines will waste much of the larger pump's power. And don't reduce it at all going from the res to the intake. If you restrict the intake you may get cavitation, and that would be the end of quiet. A 3/4" female threaded fitting with a 1" tube size going to the res would be even better. Keeping the inlet in lowest resistence flood at all times will give you: 1) better flow 2) lower noise 3) less pump wear. edit: Sence87, Good point regarding the water noise. And I believe you are correct regarding the Iwaki letter designations. Listings for barbed ones at US aquarium sites seem pretty rare, so I forgot that part. 2nd edit, Would not the much increased pressure of the Iwaki MD-30RLZT also increase the water sound a good deal? Last edited by Blackeagle; 09-10-2003 at 06:57 AM.