There is a drain valve below the canisters shown in the 4th picture. There is a valve to shut off flow to the pump also.<a href=showthread.php?s=&postid=9044911#post9044911 target=_blank>Originally posted</a> by bbehring
goodwin, not having the rainbow modules vertical may be problematic when you open the top to access the cartridges/media. These unit at this size hold a lot of water internally. I use to use 2 80 wat uvs on my pond and 4 of the cartridge mods for my tank cleaning business in the 90s. The only thing I can think of is to have a bucket ready underneath the caps when you open. Of course you will need ball valves to shut the flow to/from the mod unit. Just my thoughts from experience with rainbow mods.
<a href=showthread.php?s=&postid=9044949#post9044949 target=_blank>Originally posted</a> by bbehring
Also, I see you are using what appears to be panworld pumps. Dandy7200 did a complete thread on how to quiet these pumps down even more. .......
<a href=showthread.php?s=&postid=9054581#post9054581 target=_blank>Originally posted</a> by Deacon
Here's that Panworld mod thread for anybody that's interested:
http://www.reefcentral.com/forums/showthread.php?threadid=828812&highlight=quiet+pump