Posted: Mon May 14, 2007 9:04 pm
Check carefully for any chips or cracks at the corners. Look closely at the silicone seals inside the tank. Is it dirty or dried out (brittle)? The color should be consistent and milky, not yellow or green. Press your finger against the seal in a couple of spots, it should "give" slightly, it shouldn't feel hard or brittle.
Check the welds on the stand, they should not be cracked or rusty. Rock it back and forth a few times, it should feel solid with no squeaking or groaning.