Is your calcium build up actually silica?
Be aware that the build-up occurring could be calcium or silica. The water softening devices in whole house systems that have been around for a long time cannot cure a silica build-up.
Last year I was talking to a lady about scale build-up on bathroom fittings in the Western Bay of Plenty. She was adamant it was calcium (lime) scale and wanted a system that "would remove calcium" as she was moving into a gated community and wanted good clean water that didn't mess up the shower glass. I tried to explain that there was little (if any) problem with calcium scale in the area and she really needed a system that would address silica scale.
Silica scale is a well known problem throughout many parts of NZ, especially in the Bay of Plenty and is often (in ignorance) mistaken for lime scale. Silica is virtually impossible to remove from glass once it has formed a molecular bond, which is almost instantaneous once the water evaporates leaving the silica in direct contact with the glass. Glass is made from silica and thus they form a powerful bond under the right circumstances. The only 'in-line' filter that we have personally seen reduce the nasty effects of silica (other than RO - which is expensive and slow) is the KP Water 'Ioniser'. It's designed according to world wide accepted parameters for Magnetic Treatment of water. We use rare earth magnets to produce a very strong 'focused field'. Our happy customers have reported that this reduces the effects of water hardness (limescale) and the effects of Silica.
KP Water owns the design which has been modelled on other successful magnetic devices manufactured and used around the World. The company designed & developed it in Tauranga, initially to reduce lime scale, but over the last few years our customers have told us that it can be used to great effect for silica scale reduction.
As a company KP Water has endeavoured to give the full facts of each situation of water quality. We want ongoing business, preferably by 'word-of-mouth' rather than sell the wrong product. Our customers have certainly appreciated our clear information because we have had no complaints from any of them.