I am a new spa owner (Cape Code) and I want to purchase a second set of filters. I know if I call the dealer and ask them if there are other kinds I can use they will likely tell me ‘no, you must buy ours’. Can someone tell me if I can buy ‘off brands’? If so, what should I look for? The spa I have used the EcoPur filtration system with an inner and outer filter.
Thanks!

Take all the measurements on your current filters, this includes the outside diameter, the length, and the inside diameter of both holes (top and bottom if 2 holes) and your filter can be easily identified and replaced.