i wouldn't get too excited over numbers until someone actually measures the gph. 600gph would look like a garden hose blasting off in your tank.
also, don't forget that there might still be a good reason for the given gph. if it's this easy to get more flow from the unit, why wouldn't rena have done it themselves?...
also, don't forget that there might still be a good reason for the given gph. if it's this easy to get more flow from the unit, why wouldn't rena have done it themselves?...