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1 x Waterline Cleaning Pack - All you need to Clean your Waterline,Product Information,Waterline Cleaning pack includes a Tub scrubber and 350g of Waterline Cleaning Paste. ,Great for cleaning the waterline on your hot tub - Especially at water changes!,Save money by buying together in this exclusive pack.FAQ's regarding this product....Does the hot tub need to be empty ? - No,however the waterline cleaning paste may unbalance water chemistry,so a n empty spa is preferable. Why is a waterline caused ? - This is because your PH is unbalanced or because excessive oils and soaps are being entered into the spa.