Just bought a used Cal Spas tub - a 1997 Atlantic.

What kind of filter do I need? How would I find this out? The tub did not come with one that I could use for comparison.

There are not any Cal Spa dealers close by, so I am forced to buy them online.

Thanks.

You should be able to get a part number from here..

http://spafilters.com/cgi-bin/shop.pl/S ... ting_c.htm