Your filter is an integral part of your spa and plays a key role in maintaining the cleanliness of your bathing water.  Crystec Spas stock many filter cartridges for various Hot tub models.  It is important when purchasing filters for your spa that you record the length, width, opening diameter and thread type of your filter as this information is important when looking for a replacement.  Crystec Spas always recommend having two sets of filters and rotating them during your cleaning cycle.  It is proven to be more economical and hygienic this way.  Your filters will perform better and last longer.  Look after your filters and they will look after your spa.