I searched around and couldn't find much commentary on this piece of equipment, it is an Aqua Doc by Aqua Nova that supposedly does a bunch of things that improve the condition of the pool water through some very strong magnets, the links below are two old PDF ads about the version I have in place. Is this thing legit, is it really a nice feature to have?
http://shop.solardirect.com/pdf/energy-savings/appliances/aqua-doc-t-brochure.pdf
http://shop.solardirect.com/pdf/energy-savings/appliances/aqua-doc-m-brochure.pdf
http://shop.solardirect.com/pdf/energy-savings/appliances/aqua-doc-t-brochure.pdf
http://shop.solardirect.com/pdf/energy-savings/appliances/aqua-doc-m-brochure.pdf