CPR Overflows and Slurping Noise

[showfish]

I just installed a CPR 102 external overflow box with two 1" bulkheads. The problem I'm having is, the water level in the bottom of the overflow box is only about 2", and it makes a slurping sound. I have tried adjusting the air exhaust tubes that slide down into the bulkheads, but no change noted with the noise level. I'm thinking about building two small durso pipe stands (maybe 4 or 5 inches tall) to go inside of the overflow box. Does anyone out there have any experience with these overflows? Is it possible to fit two durso stand pipes in these overflow boxes? I need to solve this problem, for the noise is driving the wife crazy! and I think she might go for the hammer

[fergo]

I have heard that if you put a 90 degree elbow on the exit pipe of the overflow it will stop the slurping

[weez1959]

I have 90 degree elbows in my CPR overflow and I still have crazy slurping noise, after a year of hearing this I'm getting a drilled tank.
I don't know what to tell you, I've tried everything you mentioned with my CPR overflow except the durso standpipe and nothing works, I don't think dursos will fit in that box but it's worth a try...

[Poseidon]

I have a simple solution that works for me. I cut out a piece of eggcrate to fit in the overflow resting on the 2 screen guards, then grab a handful of "filter floss" (or poly-fil from the fabric store) and place it on top of the egg crate, put the top back on, and now you have a virtually silent overflow!

Just remember to change that filter floss every 10 days or so, and you will be fine!

[Reefland]

Instead of the durso pipes, look at the stockman standpipes.

[showfish]

Thanks for all the ideas (all good ones). I agree Weez, I'm not sure if the durso pipes will fit in the return chamber. I think I will try that eggcrate method, and see what happens. One question about this method, by putting filter floss in the return chamber is this reducing the water level in the chamber, or increasing it. I think the problem with these things is that not enough water sits in the return chamber (hense the slurpping noise). I guess this is my project for this weekend. I'll keep you posted of any successes or failures.

[Poseidon]

The eggcrate and floss won't change the water level much, but the wet filter floss is a GREAT sound absorber. The downside to this, is you have to keep an eye on it, or else the overflow will quit when the floss gets to dirty. (It won't let enough water through.)

[showfish]

Thanks Poseidon, I'll give it a try. If that doesn't work I'll try two Stockman style stand pipes maybe, or I'll just get rid of the wife (Oh the sacrifices we make for this hobby) !!!

[FireEater]

Putting in a 90 degree elbow is basically like putting in a Durso Standpipe minus the tee that you drill the hole in.

For those of you who have done this already, try this. Take another elbow and then a small piece of pipe so you can connect the two elbow together. Do not worry about gluing any of this together.

Now stick the piece of pipe into the elbow and then stick the other end into the elbow already in your overflow. Basically you are make a downward "U" at this point.

Then drill the new elbow with a hole the size of a toothpick in the top of it and you will basically have a Durso Standpipe. The water in your overflow will rise up to the level of your elbows and drain down below without any noise. The hole you drill will keep the level and flow constant. If you get the flushing sound right away, try drilling the hole one size bigger.

If after a while you start to get the flushing noise, then use a toothpick to clean out the hole. It might get plugged with salt creep or algae after some time.

My two durso's have been running for years without problems.

[PDAJunkie]

I kinda like all that noise. Drowns out the wife most of the time.