I'm tempted by purchase the Hallmark pump mentioned by Valveman for my cistern, but there are a quite a few negative reviews on Amazon where the pump only works for a few months then gives up the ghost. Anyone had this pump installed with a CSV where it has lasted under normal use for more than a couple of years? Also, what are the differences between the 1HP 230v and the 1HP 110v model? Is one preferable over the other? Finally, If I decide to not go with the Hallmark pump, what specs should I be looking at for a submersible cistern pump? Cistern is a 3000 gallon tank buried next to my house. Thanks!