If you are in England, you have fluoride in your water. Along with many other dissolved solids not removed by ionizers, fluoride is not.
You will get better results with an RO/Vitalizer Plus combination. These can be obtained for under $1000.
You get purified water (not carbon filtered only as with ionizers), replication of Natures energizing quartet (far infrared, magnetics, aeration and vortexing). You get the structuring, high working energy non stimulatory (no energy is produced by ionizers, only electrons) and a result you can feel immediately. You should work up to a 27 minute cycle for outstanding results to have water waiting any time you wish to drink.