Photographs, photographs!

Models, piping layout & sizes, etc. matter when making a selection. If the equipment you have is still current, you can probably do a direct swap out, which is usually the easiest and possibly the cheapest option.

Send pics to poolforum@gmail.com. I'm going to try to turn on attachments for subscribers, so you can try to directly attach the photos. (Though I will migrate them to Picasa, since the forum software tends to 'lose' all the pictures each time I have to upgrade.)