Does a SCWD reduce flow or pump efficinecy?

drouner · 04/16/2006, 03:34 PM

I have running an Mag 7 w/ a SCWD for a year or so on a CL system. I bought one when it was all the rage.

I often wonder if the SCWD cuts down on the flow rate or efficinecy. I like it's concept of alternating flow, but my gut is telling me that it really reduces the pumps flow.

I was thinking about dropping it and going with a Sea Swirl. Any comments or feed back on either?

mfinn · 04/16/2006, 03:35 PM

I have read that they do reduce the flow.

Ti · 04/16/2006, 03:43 PM

yes it would.

mikeatjac · 04/16/2006, 03:54 PM

About 25%.

drouner · 04/16/2006, 04:13 PM

25% !! That is quite a bit after you take into consideration the already reduction in flow from your piping.

mfinn · 04/16/2006, 04:18 PM

There is a mod you can do to open up the two ports, so that the reduction in flow isn't so bad.

hahnmeister · 04/16/2006, 04:56 PM

the percentage of flow reduction depends on the pressure rating and fow of the pump. In general, the larger the flow, the larger the flow reduction...more than 25% if you run a Mag9 or 12 on it...more like 40%.

04/16/2006, 03:34 PM	#1
drouner Registered Member Join Date: Jun 2001 Location: Lawrenceville, GA Posts: 668	Does a SCWD reduce flow or pump efficinecy? I have running an Mag 7 w/ a SCWD for a year or so on a CL system. I bought one when it was all the rage. I often wonder if the SCWD cuts down on the flow rate or efficinecy. I like it's concept of alternating flow, but my gut is telling me that it really reduces the pumps flow. I was thinking about dropping it and going with a Sea Swirl. Any comments or feed back on either? __________________ Doug I'm just happy to be here! It all started with a 10 gallon Wal Mart FW combo. Current Tank Info: Old school Oceanic 58 gallon mixed reef

04/16/2006, 03:35 PM	#2
mfinn Registered Member Join Date: Apr 2002 Location: Olympia. WA. Posts: 8,648	I have read that they do reduce the flow. __________________ 240 gallon soft coral tank 50 gallon lps tank

04/16/2006, 03:43 PM	#3
Ti Registered Member Join Date: Oct 2004 Location: Bay Area Posts: 7,927	yes it would. __________________ Hair algae is my Macro algae.

04/16/2006, 03:54 PM	#4
mikeatjac Registered Member Join Date: Aug 2004 Location: Jacksonville, Florida Posts: 2,433	About 25%. __________________ Red Sea Reefer 525 - BK 160- G5 Blue - GHL

04/16/2006, 04:13 PM	#5
drouner Registered Member Join Date: Jun 2001 Location: Lawrenceville, GA Posts: 668	25% !! That is quite a bit after you take into consideration the already reduction in flow from your piping. __________________ Doug I'm just happy to be here! It all started with a 10 gallon Wal Mart FW combo. Current Tank Info: Old school Oceanic 58 gallon mixed reef

04/16/2006, 04:18 PM	#6
mfinn Registered Member Join Date: Apr 2002 Location: Olympia. WA. Posts: 8,648	There is a mod you can do to open up the two ports, so that the reduction in flow isn't so bad. __________________ 240 gallon soft coral tank 50 gallon lps tank

04/16/2006, 04:56 PM	#7
hahnmeister Moved On Join Date: Sep 2005 Location: Brew City, WI Posts: 10,156	the percentage of flow reduction depends on the pressure rating and fow of the pump. In general, the larger the flow, the larger the flow reduction...more than 25% if you run a Mag9 or 12 on it...more like 40%.