Keeping your spa filter clean is vitally important if good water quality is going to be achieved, (see Filtration section) and Filter Brite is the easiest and most effective way to clean your cartridge filter element. Supplied in a 100g sachet means application is simple. All you have to do is add 1 x 100g sachet to a bucket containing 20 litres of water then immerse your cartridge element in the solution and leave it to soak overnight. Next morning rinse the cartridge element thoroughly and allow it to dry before returning it to the filter housing. Filter Brite will rid your cartridge element of scale, oils and greases and restore filter efficiency.