Does anyone have experience of limescale prevention systems that actually work without breaking the bank. My area has hard water and having tried electrical units at a £90 cost previously and thrown them away as I could see no difference I am looking for something that works to prevent scale build up as the shower head will become blocked within 2 weeks, it also affects taps and kettles, irons etc. Ideally I would want to keep my outlet low and if you could advise on what not to buy as well as what you know is ok. I was told rightly or wrongly I do not want the ones using salt as I will be using it for drinking water also.