master with lifetime warranty is $75.00

installed 2, and both have went bad - first lasted 2 weeks

i asked kragen if these pumps had problems and if it were best that i upgrade.. they said nope this is first bad one we've had

3 months later, u guessed it! 2nd one goes bad!

so what im asking is the one made by carter $115.00 with 1 yr warr

made better, and also, somebody else suggested that the tank be flushed out.. is this true?