oops, cvermeulen is right, eductor is the correct spelling and it works the same way. necro, you don't need any props for it, you're thinking of the prop pump mods. an eductor simply works by using the velocity and pressure from your normal return pumps to draw water through a set of hopes drilled behind the return nozzle, basic physics. if you don't want to make them yourself and are using 1" returns, you can buy some here on ebay http://cgi.ebay.com/W-Lim-Corp-Mixi...75722051QQcmdZViewItemQQptZLH_DefaultDomain_0
http://cgi.ebay.com/Eductor-Acceler...5|66:2|65:12|39:1|240:1318|301:1|293:1|294:50
http://cgi.ebay.com/Flow-Accelerato...5|66:2|65:12|39:1|240:1318|301:1|293:1|294:50
here's the DIY thread
http://www.reefcentral.com/forums/showthread.php?s=&threadid=1099596&perpage=25&pagenumber=3
http://cgi.ebay.com/Eductor-Acceler...5|66:2|65:12|39:1|240:1318|301:1|293:1|294:50
http://cgi.ebay.com/Flow-Accelerato...5|66:2|65:12|39:1|240:1318|301:1|293:1|294:50
here's the DIY thread
http://www.reefcentral.com/forums/showthread.php?s=&threadid=1099596&perpage=25&pagenumber=3