About The Filter Tap
An independent publisher that reads the manuals, checks the certification listings against the certifying body, and tells you what shower filters cannot do before telling you which to buy.
What this site is
The Filter Tap covers one small category exhaustively: shower and hard-water filters. 57 pages, 15 products compiled specification by specification, and one argument running through all of it — that this category is named after a problem it does not solve, and is genuinely useful for the different problem it does.
The idea is simple. Almost every page ranking for these terms recommends a single best filter to everybody, without asking the one question that decides the answer: whether your utility uses free chlorine or chloramine. And almost every product is marketed as a “water softener” while containing media that cannot soften anything. Both of those are fixable by reading carefully and writing it down.
Who writes this
Scooter M.. An enthusiast who is genuinely into this: I read the manuals, pull the published specifications into one table, check the certification listings against the body that supposedly issued them, and do the arithmetic. No lab coat.
That framing is deliberate and it is the accurate one. I hold no water treatment credential. I am not a chemist, a plumber, a dermatologist or a certified water specialist, and this site employs none of those. What I can honestly offer is care with primary sources and a willingness to publish the answer that costs us a sale.
Claims we refuse to make
Everyone in this category says they tested twenty filters. We have not tested any, and we say so. What we do instead: compile the published specifications, check the certification listings against the certifying body, credit other people’s lab results to them by name, and show the cost arithmetic in public.
That is not a smaller thing than testing. It is a different thing, and in a category where 11 of 15 products carry no traceable certification at all, it turns out to be the more useful one.
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Units we claim to have tested
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Sponsored placements
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Free products accepted
The argument, in three sentences
- No shower filter softens water. Contact time inside a shower head is roughly 0.10 to 0.14 seconds, and ion exchange needs seconds. The full explanation.
- They do reduce chlorine, and that is worth having. Measured reductions in independent testing ran from 42 to 100 percent depending on the unit — which is why which filter matters. The measurements.
- Chlorine and chloramine are different problems. KDF handles one and not the other, and the certification does not test the second at all. Find out which you have.
How this is funded
Affiliate commission from Amazon, disclosed on every page that carries a buy link and set out in full on the disclosure page. It costs you nothing extra and it does not decide what we recommend or in what order — a claim that is easy to make, so judge it against the pages here that talk readers out of a purchase entirely.
Who publishes this
The Filter Tap is operated by Slate Mill Group. It is a national publisher with no premises, no service area and no customers, which is why there is no phone number and no address on this site — inventing either would be fabricated contact data. The one address that reaches us is info@thefiltertap.com.
If you read three pages, read these
- How we rank shower filters — the method, specific enough to reproduce.
- Shower filter vs water softener — the decision most people get wrong before they start shopping.
- Certifications explained — what NSF/ANSI 177 actually covers, which is much less than the boxes imply.
Corrections
If something here is wrong, tell us and we will fix it and date the correction on the editorial policy page. Corrections get answered before anything else in the inbox.