Each flush on the Harvey is 17l, so the 750 flushes 17/750 = 2¼% of the water (which incidentally is under the 4% threshold on the Water Usage calculation required for Part G approval). And these have a guideline maximum PPM of 320K/, so the 750 is advised for a maximum of ~ 430 ppm water hardness. The basic Harveys internals are boxed and rebadged by a number of suppliers: Harveys, TwinTec, Fountain Softeners, but the versions currently shipping are one of four standard Harveys models under the hood: 500, 750, 1000, 1400 (which relates to the volume of water in litres per flush). The Harvey system seems to be viewed as the best in terms of performance and running cost and a few of the others on the forum use one and have recommended it, so we went with this choice. All of the rest are niche suppliers, IMO. As far as I can see you are down to one of two options for a direct plumbing solution: the UK Harvey twin tank system and the US Kinetico range. If you have a Combi boiler, or SunAmp, or pretty much any device with a built in Plate Heat Exchanger (PHE) and live in any region which has hard water (about 80% the UK population), then you will need a water softener if you want any decent life out of your plumbing installation.
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