Check valve suggestions..

[Mr Pleco]

anyone have an alternative to using a PVC check valve on the sump return lines ? Had too many of these spring valves fail to work when I turn the power over to test a new sump system. Anyone have a more reliable automatic alternative to prevent water from back flowing though return lines?? (Note aquarium is drilled and return lines are mid line placed through bulkheads. ) tnx

 

[Drstrangelove]

I don't know if this will help, but it's at least interesting reading.

http://www.dft-valves.com/pdf/literature/general-information/CheckValveBacktoBasicsArticle.pdf