Sprite Slim-Line 2 vs Culligan HSH-C135
Two products, one certifying body, and the only head-to-head on this site where both units hold a traceable mark. What separates them is everything the certification does not cover.
Disclosure — some links on this page go to Amazon, and we earn a commission if you buy through them. It costs you nothing extra and it does not change what we recommend or in what order. The full disclosure.
Both are certified to NSF/ANSI 177 by IAPMO R&T and both publish 1.8 GPM and 10,000 gallons or six months. Sprite names its media and was independently measured at 42 percent chlorine reduction. Culligan publishes no media at all and is a handheld head rather than an inline body. Sprite is substantially cheaper.
Quick picks
Ranked on what can be verified: a traceable certification first, then media matched to your disinfectant. Tap a row to jump to the full write-up.
| # | Product | Best for | Certification | Price |
|---|---|---|---|---|
| 1 |  Sprite Slim-Line 2Certified to NSF/ANSI 177 by IAPMO, and the most instructive product in this set: when WaterFilterGuru measured it independently they got 42% chlorine reduction — a reminder that the certification floor is 50% of a controlled challenge, not a promise about your shower.KDF media with calcium sulfite, branded "Chl… | Certified media, honestly benchmarked | NSF/ANSI 177 | |
| 2 |  Culligan HSH-C135One of the few units in this category with a certification you can trace to the body that issued it. Culligan states plainly that the HSH-C135 is tested and certified by IAPMO R&T, and it runs the same WHR-140 cartridge and the same 10,000-gallon interval as the rest of its filtered range.Not published | A certified handheld shower head | NSF/ANSI 177 |
Every figure in this table links to the page it came from in the write-ups below. Units we claim to have tested: 0.
Sprite Slim-Line 2
Certified media, honestly benchmarked
Certified to NSF/ANSI 177 by IAPMO, and the most instructive product in this set: when WaterFilterGuru measured it independently they got 42% chlorine reduction — a reminder that the certification floor is 50% of a controlled challenge, not a promise about your shower.
Published specifications
- Filter media
- KDF media with calcium sulfite, branded "Chlorgon"Source: WaterFilterGuru, "Sprite Slim-Line 2 Shower Filter: A Data-Driven Review" (retrieved 2026-09-01)
- Stated flow rate
- 1.8 GPM claimed; 1.65 GPM measured independentlyThe measured figure is WaterFilterGuru's, not ours.Source: WaterFilterGuru, "Sprite Slim-Line 2 Shower Filter: A Data-Driven Review" (retrieved 2026-09-01)
- Rated cartridge life
- 10,000 gallons, or 6 monthsSource: WaterFilterGuru, "Sprite Slim-Line 2 Shower Filter: A Data-Driven Review" (retrieved 2026-09-01)
- Chloramine
- Not publishedNo chloramine performance is published for this unit.
- Format
- Inline, fits between the arm and any shower headSource: Sprite Slim-Line 2 — listing on Amazon.com (retrieved 2026-09-01)
- Housing
- PlasticDescribed in the independent review as feeling flimsier than most of the filters tested alongside it.Source: WaterFilterGuru, "Sprite Slim-Line 2 Shower Filter: A Data-Driven Review" (retrieved 2026-09-01)
What it does well
- NSF/ANSI 177 certification from IAPMO, per the independent review that checked it
- KDF plus calcium sulfite, a media pairing with a real mechanism behind it
- 10,000 gallon / 6 month cartridge
- Low-profile inline body, roughly an inch and a half tall
Where it falls short
- Independently measured at 42% chlorine reduction, well below the marketing
- Plastic housing described by that reviewer as flimsier than most
- Measured flow of 1.65 GPM against a claimed 1.8
What it does not do
- It does not soften water. Independent measurement found hardness effectively unchanged at 128.19 PPM going in.
- It publishes no chloramine performance.
- Its certification does not mean 100% chlorine removal in your shower.
Who it is for
A reader who wants the certification and the caveat together, and who values a low-profile inline unit that does not change their shower head.
Skip it if
You want the highest measured chlorine reduction available. On the one independent measurement we could find, this was not it.
#ad · how we are funded · price as of October 16, 2026
Culligan HSH-C135
A certified handheld shower head
One of the few units in this category with a certification you can trace to the body that issued it. Culligan states plainly that the HSH-C135 is tested and certified by IAPMO R&T, and it runs the same WHR-140 cartridge and the same 10,000-gallon interval as the rest of its filtered range.
Published specifications
- Filter media
- Not publishedCulligan states what the unit reduces, but not what media does the reducing.
- Stated flow rate
- 1.8 GPMSource: Culligan — HSH-C135 hand-held filtered showerhead (retrieved 2026-09-01)
- Rated cartridge life
- 10,000 gallons, or 6 monthsSource: Culligan — HSH-C135 hand-held filtered showerhead (retrieved 2026-09-01)
- Chloramine
- Not publishedCulligan publishes nothing about chloramine for this unit.
- Format
- Handheld shower head with integrated filter, supplied with a hose and wall bracketSource: Culligan — HSH-C135 hand-held filtered showerhead (retrieved 2026-09-01)
- Housing
- Plastic, chrome finishSource: Culligan HSH-C135 — listing on Amazon.com (retrieved 2026-09-01)
What it does well
- Explicitly "tested and certified by IAPMO R&T", with the certifying body named
- Published cartridge life of 10,000 gallons or 6 months
- Five spray settings and a published 1.8 GPM rating
- The WHR-140 cartridge is shared across several Culligan units, which keeps it easy to find
Where it falls short
- Culligan does not publish what is inside the cartridge
- No chloramine data
- Replaces the shower head rather than adding to it
What it does not do
- It does not soften water, and Culligan does not claim it does.
- It states nothing about chloramine.
- Culligan does not publish the filter media used in it.
Who it is for
Someone who wants a certified chlorine filter, and who wants a handheld on a hose rather than a fixed head or an inline unit.
Skip it if
You like your current shower head. This replaces it, and its 1.8 GPM is a fixed part of the deal.
#ad · how we are funded · price as of October 16, 2026
Side by side
The 42 percent and 1.65 GPM figures are WaterFilterGuru's measurements, credited below. We tested neither.
Two certifications, one certifier, and what that settles
Across everything we cover, four products hold a device-level certification to NSF/ANSI 177. Two of them are here, both issued by the same accredited body. That makes this the only comparison on the site where the certification question — the one we usually spend half a page on — is simply settled for both sides.
What the mark guarantees is the same for each: at least 50 percent free available chlorine reduction from a 2.0 mg/L challenge across the cartridge's rated life, material safety, structural integrity to 125 psi, a minimum flow rate, and accurate product literature. What it does not cover is also the same: hardness, chloramine, metals, fluoride, PFAS. The standard in full.
So the decision has to be made on everything the certification leaves out — and on that ground the two are very different products.
The measurement that complicates the certified side
When WaterFilterGuru benched the Slim-Line 2 they measured 42 percent chlorine reduction — below the 50 percent floor the standard requires. We rank it first here anyway, and we are not going to bury that number.
One reading, on one supply, at one influent concentration, at an unknown cartridge age, is not a performance record. A certification is an audited, repeated floor measured under defined conditions; a single bench test is a snapshot under different ones. Both things can be true. What the 42 percent does establish is that a certification is a floor rather than a promise about the number on your wall — which is a useful correction on a page about two certified products.
Culligan has no equivalent measurement, which is not the same as doing better. It means nobody has checked.
One publishes its media; the other will not
Sprite names Chlorgon, a KDF and calcium sulfite blend. Culligan publishes what the unit reduces — chlorine, sulfur odor and scale — and never what does the reducing.
That gap has a practical consequence. With Sprite's media list you can work out that it is a free-chlorine product and that chloraminated water needs a different media class. With Culligan you cannot form the question. A certified filter that will not name its contents is an odd combination, and it is the single thing we would change about the Culligan.
Format is the real decision
The Slim-Line 2 is an inline body that sits between the arm and whatever head you already own — slim, as the name says, which matters in a tight enclosure. The Culligan is the head: a handheld on a hose with a bracket, so your existing head comes off and its 1.8 GPM is a fixed part of the deal.
If you want a handheld anyway, Culligan bundles the filtration into that purchase and is the only certified handheld we cover. If you like your current shower head, the inline route leaves it alone. The full format comparison.
Price, and the cartridge families behind them
Sprite is substantially the cheaper of the two — it is the cheapest certified unit we cover at all. Both run commodity cartridges with real distribution: Sprite's SLC covers its whole Slim-Line range, and Culligan's WHR-140 fits the WSH-C125, ISH-100 and HSH-C135, which is one of the widest shared families in this category. Neither locks you into a proprietary pod. The replacement-cartridge landscape.
The verdict
- Buy the Sprite Slim-Line 2 if you want the cheapest traceable certification, a named media list, and to keep the shower head you already own. Buy it expecting a competent filter rather than a spectacular one.
- Buy the Culligan HSH-C135 if you want a handheld and a certification in one purchase, and you can accept not knowing what is in the cartridge.
- Neither addresses chloramine. Neither publishes anything about it, and the standard they both hold does not evaluate it.
- Neither softens water. Culligan's "scale" wording is about deposits, not hardness.
What we would skip, and why
Questions people actually ask
+ Which is better, Sprite or Culligan?
Both hold the same IAPMO certification to NSF/ANSI 177. Sprite is cheaper, names its media and keeps your existing shower head; Culligan gives you a certified handheld but publishes no media list. On verifiable information Sprite gives you more for less.
+ Are both the Sprite and Culligan NSF certified?
Both are certified to NSF/ANSI 177 by IAPMO R&T, which is an accredited body that certifies to NSF standards and keeps its own listing directory, separate from NSF's own.
+ Why was the Sprite measured at only 42 percent?
That is one independent bench reading at an unknown cartridge age on one supply, below the 50 percent floor the standard requires. A certification is an audited floor measured under defined conditions rather than a guarantee of the number on your wall. Culligan has no equivalent measurement at all.
+ Do either of them remove chloramine?
Neither publishes anything about chloramine, and NSF/ANSI 177 explicitly does not evaluate it. If your utility uses chloramine you want vitamin C or catalytic carbon instead.
Sources
Everything on this page traces to one of these. Where a source is brand-owned we say so, because a filter maker explaining filter chemistry has an interest and you are entitled to weigh it.
- WaterFilterGuru, "Sprite Slim-Line 2 Shower Filter: A Data-Driven Review" (retrieved 2026-09-01)
- Plumbing & Mechanical, "NSF/ANSI Standard 177: A Level Playing Field for Shower Filter Claims" (retrieved 2026-09-01)
- NSF — NSF/ANSI 177 shower filter certification program
- WaterFilterGuru, "The Best Shower Head Filter" — independent lab testing, credited to them (retrieved 2026-09-01)