Osmio MaxiSoft Refill 1kg 240,000 litres
$130
This product uses polyphosphate which is proportionally dosed into the water at 5ppm (or 5 mg/l). It cannot over-dose the water for the level is always between 3-5ppm.
Polyphosphate is a good grade, non-toxic substance that is used widely in coffee machine filters and jug filters and has a long-established record of being safe to use and drink. Therefore, this product can be installed at the entry point of a property and serve the entire building.
This new technology is better than alternative solutions such as salt-based softeners, which are the most heavyweight, expensive, and environmentally damaging and are not an option if you have no sewerage services and your own septic tank. Salty water down the drain is an environmental disaster, especially for waste water treatment.