ACTIVE Spa Hot Tub Filter Cleaner - 32oz (2-4 Uses) Cleaning Soaking Solution, Hot Tubs & Pool Cartridge Cleaner, Natural Power Degreaser to Revive & Prolong O-Filters Life Time - Made in USABrand: ACTIVE Color: Clear Features: Best Value Cleaners: ACTIVE Spa Filter Cleaner for Hot Tub comes in a Concentrated 32 oz Liquid. Depending on the size of your cartridge filter, this will last for 2+ Treatments. Easy Overnight Soak: Dilute ACTIVE Pool Filter Cleaner in 4 Gallon of Water per 16oz and soak filter for 12 Hours. Compare to Tablets, Spray,or other "Instant" Formulas that don't give your filer a thorough wash Extend Cartridge Life: Use