I need to replace a corroded piece of galvinized drain coming from my kitchen sink and dishwasher. Currently, the drain goes out to a catch basin outside my house, then comes back in at a higher height (what doesn't sink floats right?). When I replace this, should I just replace the one horz pipe thats corroded? or take this opportunity to start cleaning things up a bit? Current village code says I can fill in the catch basin with sand and just tie into the stack. Although... I have never had a backup from kitchen scraps on Christmas morning (which always seemed to happen to my dad when I was little).