I'll be the first one to tell ya, if I had to buy another overflow, it would be a U-tube type overflow. But only because of their price.
CPR's are great overflows IF
you have a good PH
(i.e. Maxijet) used to keep the siphon going. The problem is, a lot of people are using cheaper PH
's (i.e. Rio's) and don't maintain them properly. Once the siphon breaks on the overflow, the next step is the contents of your sump being pumped to the floor.
I have been running mine for a year and I have had ZERO problems with it. As long as the PH
is cleaned regularly, I never will. Even if the PH
is turned off, the siphon will still stay intact for a while. It only breaks if air enters the overflow which can only happen if a lot of wave action causes air to be pulled in.
The nice thing about the CPR's is that they can start back up right away in the event of a power failure. I have never used a U-tube overflow, but will their siphon not break if the sump pump loses power?