Well, Zodiac finally emailed back. Here is the reply.

Hello,

Thank you for your interest in Zodiac Salt Systems. The LM3 is not on our web site because it is not available in Canada. There are different Zodiac product lines in every country based on the demand in their markets. I can assure you that you have made a wise decision with the LM2 Series unit and it will perform to your expectations. Basically the only difference between the LM2 and the LM3 is the shape of the cell; all of the features on the power pack are the same.

I hope this helps. If you have any further questions, please don't hesitate to ask.

Best regards,

Kristina Gagnon
Customer Service Manager
Zodiac Pool Care Canada Ltd.
tel: 905-825-5439 toll free 1-888-647-4004
fax: 905-825-5780
www.zpc.ca