Jay Posted November 19, 2007 Share Posted November 19, 2007 Hey everyone: I have 2 returns from my sump. I have the center overflow because my tank is a cube type walk around tank and the returns go up through the center of the overflow and out the side with those bendable nozels that you can aim the direction you want the flow to go. Right now if I have a power outage the water will flow down the returns into my sump and fill it up..which is ok as long as I dont put the returns to far down in the tank so it will only siphen so much to the sump. I have a line on my sump to fill up to and it will not overflow as it is. Is there a check valve I can get to go in the return line to prevent a back siphen? I know I could drill a hole in the return but seems a check valve would be better then I could actually aim my returns where I want without worry. It is the clear plastic 3/4 inch tubeing plummed from my sump to the bottom of the tank where it connects to plastic pvc. So the check valve needs to be for the plastic clear tube. I know good question right. Jay Quote Link to comment Share on other sites More sharing options...
reefgeek84 Posted November 19, 2007 Share Posted November 19, 2007 Hey everyone: I have 2 returns from my sump. I have the center overflow because my tank is a cube type walk around tank and the returns go up through the center of the overflow and out the side with those bendable nozels that you can aim the direction you want the flow to go. Right now if I have a power outage the water will flow down the returns into my sump and fill it up..which is ok as long as I dont put the returns to far down in the tank so it will only siphen so much to the sump. I have a line on my sump to fill up to and it will not overflow as it is. Is there a check valve I can get to go in the return line to prevent a back siphen? I know I could drill a hole in the return but seems a check valve would be better then I could actually aim my returns where I want without worry. It is the clear plastic 3/4 inch tubeing plummed from my sump to the bottom of the tank where it connects to plastic pvc. So the check valve needs to be for the plastic clear tube. I know good question right. Jay I would just drill a couple of siphon break holes just below the water line and that will solve the problem... Quote Link to comment Share on other sites More sharing options...
Nyles Posted November 19, 2007 Share Posted November 19, 2007 I agree.... plus a check valve reduces flow and the spring type rust... plus they fail... trust me, drill a hole just below the water line and it will work perfectly. Quote Link to comment Share on other sites More sharing options...
jayR Posted November 19, 2007 Share Posted November 19, 2007 Agreed with all of the replies, check valves eventually fail. So i just put a small hole right below the water line to break the siphon. Quote Link to comment Share on other sites More sharing options...
Guest Mbeef61 Posted November 19, 2007 Share Posted November 19, 2007 2 small holes is even better. Quote Link to comment Share on other sites More sharing options...
reefgeek84 Posted November 19, 2007 Share Posted November 19, 2007 2 small holes is even better. Yeah, I was going to add that... this is just to be safe, and for some reason if one gets clogged and you to not realized it you will not have an issue...so just do a couple... Quote Link to comment Share on other sites More sharing options...
fly guy Posted November 19, 2007 Share Posted November 19, 2007 or you san simply dop as I do and have the ruturns set up in such a way that the water falls away from them breaking the siphon. Definitely no check valve though regardless of how you do ti Quote Link to comment Share on other sites More sharing options...
WAVES Posted November 19, 2007 Share Posted November 19, 2007 You can drill these holes inside your overflow box if your returns come up through it, this way you dont have to worry about it changing height or if its even just at the water line. Just be sure your stand pipe is below it so when the overflow box drains, air can be drawn into your return lines. Quote Link to comment Share on other sites More sharing options...
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