How Often?

[Anonymous]

IMO those designs with long flat syphons are more prone to accumulating bubbles and breaking syphon. Therefore the pump to keep the syphon going is more critical.

U tubes with less area and a smoother curve have faster waterflow and therefore the bubbles and better able to be forced completely through the tube.

You could also add a "tap" to the U-tube and run an air tube down to your return pump intake. Actually you could do that anyway. the idea is that if air accumulates the pump intake will suck it out to restore or even start the syphon.

 

[polcat]

Thanks for all the imput. What do you think of the overflows on ebay that come with pump incase of a power outage. They have the same design as the others posted but also come witha pump.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=46310&item=4369650764&rd=1

That is exactly the one I would stay away from. If you notice there is no U-tube just a wier that is difficult to keep siphon hence the pump and another piece of equipment to worry about.

 

[polcat]

here is one, if you look close you will see the two U-tubes going over the back, much better design. I would go with the dual one if you have enough flow from your return pump.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=3212&item=4369030597&rd=1&ssPageName=WDVW

 

[polcat]

Note: The CPR does not require an air pump but some small water pump that will pull water out of a little hole on the top. You don't want to put air into the tube but take it out.

Actually it's a vacum pump :lol:

 

[Mihai]

Spoonie, you don't get it do you? I told you that it will not work. There is no question of if it will work for a while, or being scared to leave the house, or that it's likely to flood. You can scrap all these fears - it will not work at all the very first time you'll try. So, there will be no flood as you'll be there. It will be all over in less than 5 minutes: either a flood, but more likely a pump running dry. The only way this works is if you use float switches to stop the pumps when you're about to run dry or overflow, but that will make horrible noises and will shorten the lifetime of the pumps considerably.

Anyway, you don't seem to listen to the advice of any of this board memebers (heck! even beaslbob gave you good advice!) so go ahead and convince yourself. I'm not sure why you ask for advice though...

M.

 

[polcat]

Anyway, you don't seem to listen to the advice of any of this board memebers (heck! even beaslbob gave you good advice!) so go ahead and convince yourself. I'm not sure why you ask for advice though...

M.

Spoonie got it several post's ago.

But since my Plans have been shot to hell wich overflow box should I get that can hang on the back. I really don't want to drill my tank.

Don't beat the guy up, he put a lot of thought into his idea and as far as a two pump system goes it was a good shot at the design. Granted it won't work, so let's help him with the overflow idea now.

 

[Anonymous]

Thanks for all the imput. What do you think of the overflows on ebay that come with pump incase of a power outage. They have the same design as the others posted but also come witha pump.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=46310&item=4369650764&rd=1

The problem with that one is it is only rated for 600 GPH. If you were planning to use the MAG 9 you would have, at 4 feet of head, around 800 GPH from the pump. I personally would want something that had a higher flow rate. The one polcat posted would be a better choice. If you wanted the type like you posted then here is one from the same people who made polcat's

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... BIN_Stores

You would need to buy the pump to go on top.
Here is a link from premium aquatics.
http://www.premiumaquatics.com/Merchant ... PROverflow

Both types will work. Some people have had problems with the type with the pump on top. It worked fine for me when I had one. The type with the U tube has also been used for years with no problem.

 

[Anonymous]

You could also add a "tap" to the U-tube and run an air tube down to your return pump intake. Actually you could do that anyway. the idea is that if air accumulates the pump intake will suck it out to restore or even start the syphon.

I like this idea! ...I've got a u-tube... it's my biggest fear. 8O

~wings~

 

[polcat]

I've tried many different u-tube set ups. The problem with having an airline attached to the top of the tube and run to powerhead or the sump pump is bubbles in the tank. In my opinion the best set up is to have high enough flow where no air accumulates in the u-tube. If you run the overflow at or near capacity you should not have any bubbles to contend with. I have two 800 gph overflows and return pump in 1200 gph, there are never any bubbles in the u-tubes and I never loose siphon.

 

[spoonie]

Well I haven't bought anything yet but plan on buying the hang on overflow with the tube. I also will be bumbing up from the mag9 to the mag12 so I can push that little buddy to the limit. Hopefully somewhere around 1100gph. Now that I don't need to buy two pumps I can buy the The prizm skimmer I wanted. J/K I plan on buying the Remora pro w/mag3. I do appreciate all info and now feel I have a good setup coming soon Thanks again guys.