Does your hot tub have Hard Water? You'll need Scale Inhibitor! - Video

Hard water areas, most notable the south east of the UK, but you can search your location to find what your water calcium carbonate concentrate is.
If you find that your kettle suffers from lots of limescale, it is likely that you are in a hard water area and your hot tub water will need extra care to prevent the same thing happening inside your hot tub pipes.