Aquafinesse brand effervescent tablets for cleaning your filter.  Aquafinesse recommends that you clean your filter once a week while using their water-care system. 

Instructions for use

• Remove filter
• Fill bucket with 10 liters of warm water
• Add 2 AquaFinesse filter cleaning tables
• Place the filter in the bucket and leave for at least one hour - heavily soiled filters can be soaked for up to 24 hours.
• Ensure that the filter is completely submerged in the cleaning fluid, if there is not possible, then turn the filter regularly to ensure a thorough cleaning.
• After soaking, rinse the filter from top to bottom - a strong tap flow, shower head, or filter-cleaning tool works best.
• If possible allow the filter to dry before putting it back in your hot tub (we recommend that you have two sets of filters so you can rotate them for just this reason).