Water softener: Home Water Treatment Price Index

Every row is a verbatim sentence read from the named source's own page through the estate's fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2).

8 of the 29 named sources that could be read published a usable figure; 21 published none and are recorded as not published, never filled in; 1 could not be read (blocked, dead or unreachable) and count nowhere.

The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source in USD (a source's median where its page yielded several accepted sentences), so N counts sources, never sentences; 114 candidate sentence(s) were refused by a reviewer with the reason recorded.

Derivation as chartered: the published price of every home water treatment system, per vendor and per system type (softener, salt-free conditioner, whole-house filter, well/iron filter, under-sink and countertop RO, shower filter, pitcher), reduced to a median, minimum and maximum per type and per capacity band; the SHARE of vendors that publish a price at all against those that route to a dealer quote (Culligan, Kinetico and Pentair do not publish; SpringWell, APEC, SoftPro, Aquasure and DROP do), which no buyer can see and no vendor will tell them; the price per 1,000 grains of softening capacity and per gallon-per-day of RO capacity, so two systems quoted in different units can be compared; and repriced-since the previous read, which on this market moves with promotional cycles rather than with cost.

114 candidate sentences on these pages were refused by a reviewer; each refusal and its reason is recorded in the review ledger.