sump help

[mookie]

aright i just bought a used CPR 100 overflow with the airlift. i made a sump out of a 10g no baffles or anything just to see if and how it would work, this is my first time ever using a sump or overflow or anything like that. seems to work well at first, so i tried turning of the power to simulate a power outage and when i did that the flow comming from my return pump stoped and crated a siphon backwards back into the sump if that makes any sense, i was lucky to catch it at the last minute. how do i prevent this from happening aside from keeping the exaust out of the water?

also i noticed that it takes the CPR a long time to restart the siphon after i turn the power back on and alot of water goes into the main tank, i have a 200 GHP powerhead as a return now if i upgrade to a bigger one will the main tank overflow waiting for the siphon to start on the CPR. i belive it is a SPR 100 rated at 800GPH it has a 1" bulkhead


and one more sorry, how do i go about plumming this thing, i went to home depot and couldnt find any pvc tubing that would connect to my 1" bulkhead....if thats even what i have sould i bring my overflow into the store and just ask one of them?

 

[mikem]

Drill a small hole on the return just below the water level of the tank. This will create a vacume break. Check hole monthly cause they clog up sometimes.
Not sure on CPR's.
I would bring the bulkhead to make sure you get the right size. A pool supply place should have what you're looking for. All the overflows I have can fit both 1" and 1 1/4" hoses on them.

 

[Brian]

I'm not sure where you're located, but Ocean Gallery II usually has that vacuum hose in stock if you can't find it elsewhere.

 

[saltwater4life]

Hey did you find PVC to fit it?
i though I'd ask since I've got the same overflow and going PVC most likely