Remove cartridge(s) from your spa filter and hose off with water to remove loose debris. Fill a clean plastic container, bucket, pail or garbage can with 4 gallons of water. Empty the contents of the HTH Filter Cleaner bottle into the water to create the cleaning solution. Place the cartridge(s) upright in the solution and soak for 3 to 6 hours or overnight. Remove cartridges(s) from the solution, hose off and replace in your spa filter.
- Keep your spa filter clean with this easy-to-use filter cleaner 
- HTH Spa Filter Cleaner is great for all spas, including bromine, chlorine and biguanide 
- Helps clarify water 
- Extends life of filter 
- Deep cleans all filter types 
- For best results, use HTH Spa Filter Cleaner as part of your regular HTH Spa care routine, or every 90 days when you change out your spa water