Welcome to our forum.
I am by no means a filter expert but until your filters become more popular I would say to bite the bullet and purchase a new set from the dealer. They should last about 4 years so you'll have some time.It looks like Wellspring is a BF name for their system, I'm sure they have it made for them by another manufacturer.Honestly, you can try an "off brand" filter and it may work great. I have had my experiences with a branded name like Pleatco and it failed miserably. Maybe you can try Filbur or Unicel support to see if they have something for the newer tubs. I'm cynical but I do believe that sometimes people change things up so that you're forced to buy from them.BTW, it should read 4 gallons of WATER and an ounce of bleach! I sometimes hate my tablet (and lack of morning coffee!!)
Hope its OK to piggyback on this thread. New owner here. Don't need to replace my filters yet, but dealer says every three months.These are the filters (two at a time) that came with the tub:https://www.arcticspastore.com/filters/save-34-automatic-quarterly-shipping-silver-sentinel-open-filter-1998-2008-arctic-spas/Is there a better alternative, or cheaper alternative that is just as good?And, if replacing every three months, should they still be cleaned/rinsed during the three month period??Thanks!!