Sumps in :-)
Um ... forgive me for I must be missing a piece of the puzzle here. Maybe I'll see this better tonight. My concern is this. It shouldn't matter that the end of the intake pipe is submerged in the sump. If your pump is off, the main display tank will back-siphon down the sump return line until either a check valve slaps shut or the sump return outlet starts to suck in air. So if you don't have a check valve, eventually your return line will drain down to the water level in your sump (which in this case is below your pump). It may take several minutes for this to happen. The main question to address is, is the pump able to suck the water up from the sump level when it is dry? If so, then you don't necessarily have a problem (although I don't know how good this is for your pump). But if not ........
BTW, if the issue is that the sump is not drilled, and you do not want to go the route of a submersible return pump (such as a Mag24 or something), I can offer this: If you want, I have a diamond-tipped hole saw drill bit which can drill a hole into glass perfect size for a 1" bulkhead. I beleive the size is 1-3/4" (not sure offhand without looking at it, it is at home and I am at work ... but what I can tell you is that it is the exact size of hole you want for 1" bulkheads, whatever that is.)
[ 19 August 2002, 10:18: Message edited by: delphinus ]
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