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Product/filter

kind differentiated a true kind

filter

also called filter element

A consumable element that a fluid is passed through to take particles out of it — an oil filter, an air filter, a cabin filter, a fuel filter, a vacuum's dust filter, a coffee cone, a water cartridge. It hangs directly off Product. It is NOT a Container and NOT a Strainer: a strainer is a straining VESSEL under Container with a holding volume (an inherited `capacity`) and a coarse qualitative `mesh_grade`, which sits still and holds what it catches, while a filter has no holding volume at all, is plumbed into a flowing circuit or an air tract, and is thrown away or washed when it is full. A fine-mesh kitchen sieve is a Strainer; a ceramic water candle is a Filter, and the vessel that holds the water around it is a UtilityVessel. It earns its place over Product by six slots no other product carries: `filtration_duty` (what it cleans and in what service — the fact that makes it the thing it is), `filter_form` (spin-on canister, bare cartridge, panel, round element, cone, in-line body, in-tank sock), `filter_media` (what the element is made of, stated many times because real elements layer paper behind carbon behind a biofunctional layer), `filtration_rating` (the micron figure, with its efficiency, basis and test standard hanging off it), `thread_size` (the spin-on interface) and `water_separation`. Its body material, its outside dimensions, its brand, the maker's part number and the numbers it also answers to are all already on the universal card — `material`, `length`/`width`/`height`/`diameter`, `brand`, `manufacturer`, `trade_identifier` with `identifier_scheme`, `also_known_as`. WHICH ENGINE OR CAR IT FITS IS NOT A POOL FACT and is not stated here (REFINE-LOG 2026-08-25): a fitment is a cross-reference to a product the pool does not hold, and it lives downstream as instance prose in the shop's own words. A filter is not an automotive good — UNSPSC files the whole family in segment 40 (filtration), and the coffee cone and the water candle in this class are the proof.

the reading

A genuine kind — it answers questions its parent does not.

A filter is a product that adds its own filtration rating, filter form, filter media, filtration duty, thread size and water separation.

what it can tell you the questions a filter answers

Grouped by the part of the product each question is about. Every filter can answer all of these.

Identity who and what it is

Each filter has an also known as, a display name, a model name, a trade identifier, a single active state, a single brand, a single filter form, a single filtration duty, a single identifier exists, a single manufacturer, a single seller type, a single sub-brand and any number of tracking markings. Each trade identifier carries its own identifier scheme.

Measurement its measurable, physical facts

Beyond what a product measures, it adds its own filtration rating (in millimeters or inches). It also records depth, diameter, height, length and width (in millimeters or inches), net content (in liters) and net weight (in grams or kilograms). It has a single thread size and water separation. Each filtration rating carries its own filtration efficiency, filtration basis and filtration standard.

It has a single size system. It comes in any number of colors and materials. It offers any number of filter medias, patterns and sizes.

Pricing what it costs

It can be listed at any number of list prices, list prices, list prices, list prices, list prices and list prices. It has a single custom amount enabled. It offers any number of offered bies. Each list price carries its own price valid from, price valid until and price basis. Each offered by carries its own stance and party name. Each price component carries its own price component type and applies to payment method. Each sale price carries its own compare-at price, reference price type, promotion type, price valid from, price valid until, price eligibility and price basis. Each tier price carries its own tiers mode, tier minimum quantity, tier flat fee, price eligibility, price valid from, price valid until and price basis.

Compliance where it is from and what it meets

Each filter states its age restriction, country of origin, regulatory permit, responsible person, un number and warning. It may carry any number of certifications, geographical indications and hazard classes. Each geographical indication carries its own designated region. Each hazard class carries its own ghs pictogram and ghs signal word. Each regulatory permit carries its own permit regime. Each warning carries its own warning category.

Media how it is shown

It records description and media. Each media carries its own medium type, media role, media alt text, media facing and document type.

Availability whether it can be obtained

It has a single availability status, any number of eligible regions, any number of ineligible regions and inventory quantity. Each inventory quantity carries its own quantity state, place name and place type.

Social proof what buyers and critics say about it

A filter can carry a single fit verdict and aggregate rating, and any number of comments, community answers, community questions, reviews, review highlight tags and engagement counters. Each aggregate rating carries its own rating count. Each comment carries its own commenter name, commenter role and comment date. Each community answer carries its own answerer role, answer accepted and answer vote count. Each community question carries its own question author, question date and question vote count. Each engagement counter carries its own engagement signal, engagement window and engagement rank category. Each review carries its own review rating, review headline, review author, review date, verified purchase, review kind, review aspect, incentive disclosure, review language, review source platform, reviewer media, helpful vote count and variant reviewed.

Condition the state the item is sold in

Each filter is sold in a stated item condition. A free-text condition note can add the specifics.

It measures shipping weight (in grams or kilograms). It has a single requires shipping. It offers any number of fulfilment channels and shipping restrictions. It records hs tariff code. Each shipping rate carries its own delivery speed, shipping region, minimum handling time, maximum handling time, minimum transit time, maximum transit time and free-shipping threshold.

Tax

It has a single tax behaviour. It records tax category.

It has a single gift card. It supports any number of digital delivery methods. Each digital delivery method carries its own licence term, licence scope, delivery platform / drm, download limit and access expiry.

It has a single return policy. It records warranty. Each return policy carries its own return window, return method and return fee responsibility. Each warranty carries its own warranty scope and warranty term.

It supports any number of accepted payment methods.

It measures maximum order quantity and minimum order quantity (as a whole count of selling units). It offers any number of customer eligibilities and purchase gates.

It records personalization field. Each personalization field carries its own input type, field required and maximum length.

slot-profile what a filter answers

Every question it can answer — added here, shadowed (tightened from a parent), or inherited from above. Each answer is a token, a number + unit, or free text.

Identity who and what it is
questionanswered withhow manyfrom
active state token Active States one product
also known as free text plain text formats many product
brand token Brands many product
display name free text plain text formats required · one product
filter form new to this kind token Filter forms one added
filtration duty new to this kind token Filtration duties required · one added
identifier exists token Identifier Expectation one product
manufacturer token Manufacturers one product
model name free text plain text formats one product
seller type token Seller Types one product
sub-brand token Sub-Brands one product
tracking marking token Tracking Markings many product
trade identifier free text code formats many product
each trade identifier carries identifier scheme
Measurement its measurable, physical facts
questionanswered withhow manyfrom
depth number + unit Length units one product
diameter number + unit Length units one product
filtration rating new to this kind number + unit Length units one added
each filtration rating carries filtration efficiencyfiltration basisfiltration standard
height number + unit Length units one product
length number + unit Length units one product
net content number + unit Volume units one product
net weight number + unit Mass units one product
thread size new to this kind token Thread sizes one added
water separation new to this kind token Water separation types one added
width number + unit Length units one product
questionanswered withhow manyfrom
color token Color types many product
filter media new to this kind token Filter media types many added
material token Material types many product
pattern token Patterns many product
size token Sizes many product
size system token Size Systems one product
Compliance where it is from and what it meets
questionanswered withhow manyfrom
age restriction token Age restrictions one product
certification token Certifications many product
country of origin token Countries one product
flash point number + unit Temperature units one product
geographical indication token Geographical-indication schemes many product
each geographical indication carries designated region
hazard class token Hazard classes many product
each hazard class carries GHS pictogramGHS signal word
regulatory permit free text code formats many product
each regulatory permit carries permit regime
responsible person free text plain text formats many product
UN number free text code formats one product
warning free text longform text formats many product
each warning carries warning category
Media how it is shown
questionanswered withhow manyfrom
description free text longform text formats one product
media free text media reference formats many product
each media carries medium typemedia rolemedia alt textmedia facingdocument type
Availability whether it can be obtained
questionanswered withhow manyfrom
availability ends free text date formats one product
availability starts free text date formats one product
availability status token Availability statuses one product
eligible region token Regions many product
ineligible region token Regions many product
inventory quantity number + unit Quantity Units many product
each inventory quantity carries quantity stateplace nameplace type
Condition the state the item is sold in
questionanswered withhow manyfrom
condition note free text longform text formats one product
item condition token Item Conditions one product
Tax
questionanswered withhow manyfrom
tax behaviour token Tax Behaviours one product
tax category free text code formats one product
questionanswered withhow manyfrom
return policy token Return Policy Categories one product
each return policy carries return windowreturn methodreturn fee responsibility
warranty free text plain text formats many product
each warranty carries warranty scopewarranty term
questionanswered withhow manyfrom
accepted payment method token Payment Methods many product
questionanswered withhow manyfrom
personalization field free text plain text formats many product
each personalization field carries input typefield requiredmaximum length

refines into more specific kinds