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Effective: Our intense formula breaks down the oil, grease and grime that blocks hot tub and pool filter cartridges. Super concentrated formula: mix 500ml of solution with 10L of water. Convenient: Simply soak the filter overnight for effective cleaning - one 5-litre bottle provides up to 10 uses. Long-Lasting: Regular use of this cleaner extends the life of your hot tub or pool filter, reducing replacement costs.