Hey SJM,
You must be right because it makes sense that I would have a mess on my hands. By the way its a 120 AGA tank with their overflow stands which are supposed to be rated at 600 gph. This thread started out as a return pump suggestion for my 40G but I have also been very frustrated with the gurgling/flushing noise coming from my drain, maybe you could chime in on that too.
Here's what I got..... 1" tubing return line (3/4" ID) coming off a Mag 18 pump, it T's off with the same diameter tubing splitting off to each of the two returns. Both drain lines are 1-1/2" flex hose coming off 1 1/2" bulkheads off the bottom of the tank - originally the flex hose was like 3' long and had a few bends and curves in it which I believe was causing some noise. At the time both overflows were "flushing" fairly regular.
I have since cut both flex hoses down to about 16" which they now run pretty much straight into the sump. One of the overflows seems to have stopped flushing but the other continues. By "flushing" I mean the dropping of the water level in the overflow about 1.5 to 2 inches and then filling back up again to its normal level. (about 1 -1/2" below the top of the over flow) I'm confident that the air hole at the top of the stand pipe is clear because if I put my finger over it I can make either of the overflows flush.
It was my local LFS guy who explained how the HOB overflow worked, it was he who mentioned he had the same tank I do and that the Mag 18 was pushing too much water hence my flushing. (apparently air builds up and then releases causing a flush ???) He mentioned that he uses a Mag 12 pump and it works fine with no gurgling or flushing. He also mentioned that I could put a gate valve of somesort in the main return line to dial down the flow.
This is what has/had me confused about why I do not have a waterfall on my hands right now, if I've got to much flow then the display tank ought to overflow ???? Now I clamped a pair of vise grips on the return line thinking it served a similar purpose as a valve - restricting the water flow - but it had no effect on the flushing. I guess I'm left with no other thing to try then to drill a second hole on top of the stand pipe or running air line tubing down the standpipe which apparently has mixed reviews about whether or not that actually works....any thoughts ?
Thanks for your time.
You must be right because it makes sense that I would have a mess on my hands. By the way its a 120 AGA tank with their overflow stands which are supposed to be rated at 600 gph. This thread started out as a return pump suggestion for my 40G but I have also been very frustrated with the gurgling/flushing noise coming from my drain, maybe you could chime in on that too.
Here's what I got..... 1" tubing return line (3/4" ID) coming off a Mag 18 pump, it T's off with the same diameter tubing splitting off to each of the two returns. Both drain lines are 1-1/2" flex hose coming off 1 1/2" bulkheads off the bottom of the tank - originally the flex hose was like 3' long and had a few bends and curves in it which I believe was causing some noise. At the time both overflows were "flushing" fairly regular.
I have since cut both flex hoses down to about 16" which they now run pretty much straight into the sump. One of the overflows seems to have stopped flushing but the other continues. By "flushing" I mean the dropping of the water level in the overflow about 1.5 to 2 inches and then filling back up again to its normal level. (about 1 -1/2" below the top of the over flow) I'm confident that the air hole at the top of the stand pipe is clear because if I put my finger over it I can make either of the overflows flush.
It was my local LFS guy who explained how the HOB overflow worked, it was he who mentioned he had the same tank I do and that the Mag 18 was pushing too much water hence my flushing. (apparently air builds up and then releases causing a flush ???) He mentioned that he uses a Mag 12 pump and it works fine with no gurgling or flushing. He also mentioned that I could put a gate valve of somesort in the main return line to dial down the flow.
This is what has/had me confused about why I do not have a waterfall on my hands right now, if I've got to much flow then the display tank ought to overflow ???? Now I clamped a pair of vise grips on the return line thinking it served a similar purpose as a valve - restricting the water flow - but it had no effect on the flushing. I guess I'm left with no other thing to try then to drill a second hole on top of the stand pipe or running air line tubing down the standpipe which apparently has mixed reviews about whether or not that actually works....any thoughts ?
Thanks for your time.
