Tank/Sump W/O Holes

mark · #1 10-13-2008, 04:29 PM

not recommending the CPR or any other make of external OF, link was just for an example if wanted to go un-drilled.

I think drilling is the best way to go.

pastout · #2 10-13-2008, 05:05 PM

i have a cpr overflow i hate it. without the pump running it breaks siphon and the tank will flood and the air pump it comes with has done that 3 times for me.

Starry · #3 10-13-2008, 05:09 PM

Here is my undrilled sump. My tank has been running for 11 months with a CPR overflow, and have never had any problems, even with power outages. I use a maxijet powerhead hooked up to the overflow via the venturi air hose. Its attached to the air release nipple on the top of the overflow. I also have a check valve on my return line from the sump to prevent back siphon into the sump in case of power outate. Also return line has a few holes drilled 3/4" below water level in the tank as a back up in case the check valve fails.

MMAX · #4 10-13-2008, 08:31 PM

I don't think drilling is an option for me, both my tank and sump are tempered glass.

Abbyreefer · #5 10-13-2008, 09:06 PM

MMAX - do you have the tank set up yet or is the tank empty ? If your tank is empty - if it were me I would sel the tank and buy one that can be drilled. The CRP is ok and will get you by but trust me from personal experience you will never feel 100% with a external overflow on the tank. Its cheaper to get a tank you can drill now then to have to change it later on like I am.
If the tank is stocked then the CPR's are ok.

mark · #6 10-13-2008, 09:06 PM

Quote:

Originally Posted by MMAX

I don't think drilling is an option for me, both my tank and sump are tempered glass.

depends on tank but sometimes just the bottom tempered