"I rate this product exceptional as I have found this to be a very effective and cost saving solution to scale build up. I have tried those electronic types and wasted so much on different ones still having the build up of scale. This is a very simple system to use and if you fit a turn off valve either side of unit then makes easier to change filter. I actually use the filter for more than the 12mths have left up to 16mths until change not a recommendation but a personal choice based on residue signs appearing in kettle, which highlights the vast change in scale. We do not get the hard scale build up in the kettle and build up around taps. Oh and no nasty chemicals used in unit apparently a natural product."
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Review 2 for Scale Inhibitor Replacement Cartridge