Quote:
Originally Posted by daplatapus
I hope I don't come across as a pessimist here, but there is something about using a check valve for safety that inherently scares me. They are completely prone to failure. They rely very much on being, and staying, clean. After looking at my 9 month old tank, nothing is clean. There's tiny little spiroid worms and calcareous thingys everywhere. I can't see how a check valve could possible work after just a couple months hooked into my system. And part of the problem with check valves is you don't know they're going to fail until that one time you need them most and they stick.
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Very good to know. I'll be sure to place it where I can easily see it and get to it. We're going on vacation in August, and the tank isn't even running yet. I may wait until the week before we leave to install the check valve.
The repaired tank that we'll be using as a little bit of insurance should easily hold ten gallons for a day or two. It is the same size as the display tank: 40B. The sump should hold 5 gallons. So, we could potentially deal with 15 gallons of back siphon for a brief period of time. The repaired tank can only be relied on to be a very short term container. The returns will be positioned high enough that we shouldn't really get any back siphon.