You want to filter sediment before it gets to the softener. Carbon filters
are for drinking water so put that near the kitchen sink and icemaker tap.
No need to filter for taste the wash water and toilet use.
Carbon does both.
I'm not familiar with Calcite filters, but I did find this
Calcite is a crushed and screened white marble media which can inexpensively
be used to neutralize acidic or low pH waters to a neutral, less corrosive
Calcite is a naturally occurring calcium carbonate media. One of the
advantages of Calcite is its self-limiting property. When properly applied,
it corrects pH only enough to reach a non-corrosive equilibrium. It does
not overcorrect under normal conditions. Upon contact with calcite, acidic
waters slowly dissolve the calcium carbonate to raise the pH which reduces
potential leaching of copper, lead and other metals found in typical
plumbing systems. Periodic backwashing will prevent packing, reclassify the
bed and maintain high service rates. Depending on pH, water chemistry and
service flow, the Calcite bed will have to be periodically replenished as
the calcite is depleted.
As the Calcites calcium carbonate neutralizes the water, it will increase
hardness and a softener may become necessary after the neutralizing filter.
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