The first spa-grade shower purification system.
Cuiven Monolith™ XL uses an oversized, 6.0-inch-deep rainfall body with a labyrinth flow path and multi-stage media to deliver water that feels like a mineral spring—while targeting modern contaminants most filters ignore.
The Oversized Advantage
Bigger chamber = longer contact time + more media = real purification.
Monolith™ XL's 6.0-inch-deep cylinder forces a labyrinth path through five media stages. Compared to small filters, it packs 5–10× media and increases contact time dramatically—so it can target chlorine, chloramine, heavy metals, PFAS, VOCs, pesticides, and more while maintaining excellent flow.
Flow & Feel
Engineered for the perfect rainfall experience.
Enveloping Rainfall
Wide, gentle coverage that wraps around your entire body like a warm summer storm. No harsh jets or missed spots—just complete, luxurious immersion.
Silky Water Feel
Each drop feels softer and more hydrating than ordinary shower water. The precision-engineered spray pattern creates a spa-like sensation that transforms your daily routine.
Consistent Pressure
Perfect flow from the first drop to the last. No sputtering, no pressure drops—just steady, reliable performance that maintains the luxurious experience every time.
Every drop feels intentional. Like standing under a warm summer rain, but better.
Effortless Annual Maintenance
One cartridge change per year. That's it.
The Monolith's oversized core cartridge is engineered to last a full year for most households. When it's time to replace, the process takes just minutes with no tools required.
Set up automatic delivery or get reminded when it's time to replace your core cartridge.
Inside the Cartridge
Five stages, one purpose—spa-grade water.
Silver-infused stainless mesh
Blocks sediment, keeps internals antimicrobial.
Prefilter + antimicrobial protection
Structured KDF-55 disc + clinoptilolite zeolite
Targets chlorine, H₂S, and heavy metals.
Lead, mercury, arsenic, cadmium
Activated-alumina + catalytic carbon block
Designed to reduce fluoride, PFAS, VOCs, pesticides/herbicides.
Forever chemicals, fluoride, VOCs
Far-infrared mineral ceramics
Tourmaline/germanium lowers surface tension for silkier, more hydrating feel.
Water structure enhancement
Metered Vitamin-C capsule
Sodium ascorbate neutralizes chlorine/chloramine; dosing is controlled to extend life.
Chlorine/chloramine neutralization
Oversized chamber design
6.0" deep body provides 5-10× more media contact time than standard filters, dramatically increasing filtration efficiency and extending cartridge life.
Enhanced contact time + extended filter life
Performance varies with local water. Third-party lab testing results will be published; certifications to come.
The Ultimate Filter
Designed to reduce what beauty filters ignore.
| Contaminant | Monolith XL | Notes |
|---|---|---|
| Chlorine | ✓✓ | KDF + Vitamin-C dual action |
| Chloramine | ✓ | Vitamin-C neutralization |
| Heavy metals | ✓ | Zeolite + KDF-55 |
| PFAS | ✓ | Activated alumina + catalytic carbon |
| Fluoride | ✓ | Activated alumina |
| VOCs/solvents | ✓ | Catalytic carbon block |
| Pesticides/herbicides | ✓ | Catalytic carbon |
| Bacteria/biofilm | ✓ | Antimicrobial silver interior |
Performance varies by water chemistry, temperature, and flow. Independent lab data to be published.
Choose Your Monolith
Available in premium stainless steel or ultra-luxury titanium finish.
Monolith XL — Stainless 316
$499
Premium stainless steel construction with antimicrobial interior
Monolith Titanium Signature
$699
Ultra-luxury titanium finish for the ultimate shower experience
Replacement & Subscription
Annual XL Core Cartridge
$179
Vitamin-C Capsule
$18 each or $15/mo subscription
In the box: Monolith head, installed core cartridge, 1 Vitamin-C capsule, spare O-rings, Teflon tape, install guide.
Titanium Signature
Same exceptional performance, elevated experience. Choose titanium for the ultimate in luxury, durability, and lifetime peace of mind.
| Aspect | 316 Stainless (XL) | Titanium Signature (XL) | So what? |
|---|---|---|---|
| Density / unit weight | Heavier | ~40–45% lighter shell | Ti head ends up ~1–1.5 lb lighter overall; ~15–25% less torque on the shower arm |
| Corrosion in hot/chloride water & coastal air | Excellent | Exceptional (near-impervious) | Ti is the ultra-safe choice for coastal homes, steam showers, pool houses |
| Surface wear | Brushed steel hides light scratches; can re-brush | Raw Ti scuffs easily, but with DLC/PVD face it's harder & more scratch-resistant | Signature gets a tougher face if you pick DLC |
| Thermal feel | Similar (both low-conductivity metals) | Similar | No meaningful difference at the handle or spray |
| Sound / flow | Same | Same | No difference in shower acoustics |
| Look | Warm brushed steel | Matte grey "tool-grade" vibe; optional DLC (graphite/black) | Purely aesthetic preference |
| Warranty | 15 years | Lifetime | Titanium offers ultimate peace of mind with lifetime coverage |
| MSRP | $499 | $699 | Signature is about design, corrosion headroom, and status |
Real numbers (typical build, dry): Stainless XL ≈ 6.5–7.5 lb; Titanium XL ≈ 5.0–6.2 lb. (During use, both carry similar water mass inside.)
Choose Stainless XL if...
You want the heft and "this-is-real-hardware" feel.
Standard wall arm, normal municipal water, not on the ocean.
You want the best value.
Choose Titanium Signature if...
You're coastal, in a steam shower, or want maximum corrosion margin forever.
You like the matte grey / DLC aesthetic and a lighter head on a long wall/ceiling arm.
You want the collectible "Signature" experience.
Signature Extras
DLC/PVD Face + Laser Serial Engraving
Graphite/black coating for enhanced scratch resistance and unique identification
Reinforced 316 Wall/Ceiling Arm
Heavy-wall tubing with locking collar included in-box
Lifetime Hardware Warranty
Same lifetime coverage as stainless - built to outlive you
Founders Card + Care Kit
Microfiber care kit and exclusive founders identification
2 Extra Vitamin-C Capsules
Additional capsules included in Signature box
Technical Specifications
Shell/Face OD
7.5" (190.5 mm)
Active Spray
7.0" (178 mm)
Body Depth
6.0" (152 mm)
Wall Thickness
1.2 mm; Internal clear ID ≈ 7.35" (187 mm)
Flow Rate
2.0–2.5 GPM, pressure-compensated
Hole Count
380–480 @ 2.0–2.5 GPM
Finished Weight
~6–7.5 lb
Materials
316 stainless, antimicrobial silver mesh, polymer cartridge cage
Media Loads
KDF+zeolite 250–350g, AA+carbon 120–180g, FIR beads 150–250g
Operating Temp
40–120°F (4–49°C)
Pressure Range
20–80 psi (optimum 40–60 psi)
Connection
Standard ½" NPT shower arm
Installation
Hand-tighten + quarter-turn
Compatibility
Universal shower arm fitment
Monolith vs. Competition
See how the Cuiven Monolith XL compares to other shower filters on the market.
| Contaminant/Feature | Jolie (KDF-55 + Ca-sulfite) | Cuiven Monolith XL |
|---|---|---|
| Chlorine | ✓ | ✓✓ (KDF + Vit-C) |
| Chloramine | ≈ (weak) | ✓ (Vit-C neutralization) |
| Heavy metals (Pb, Hg, As, Cd) | ≈ | ✓ (Zeolite + KDF) |
| PFAS (forever chemicals) | — | ✓ (AA + catalytic carbon) |
| Fluoride | — | ✓ (Activated alumina) |
| VOCs/solvents/pesticides | — | ✓ (Catalytic carbon) |
| Bacteria/biofilm control | — | ✓ (Silver-infused internals) |
| Microplastics/rust | ≈ (limited) | ✓ (prefilter + block) |
| Media volume | small | 5–10× larger |
| Typical replacement | 60-90 days | Capsule 2–3 mo; Core 9–12 mo |
Reduction performance varies by water chemistry, flow, and temperature. Independent testing pending.
Simple Maintenance Schedule
Vitamin-C Capsule
Every 2–3 months (metered; region dependent)
$18 each or $15/mo subscription
Core Cartridge
9–12 months for 1–2 users (6–9 months for 3–4 users)
$179 annual replacement
Frequently Asked Questions
Will it lower my water pressure?
No—Monolith uses a pressure-compensated regulator and a high-open-area spray face.
Does it remove fluoride/PFAS?
It's designed to reduce them using activated alumina and catalytic carbon. Exact performance depends on your water; third-party results coming.
Why a capsule and a cartridge?
Vitamin-C is consumed as it works. The capsule is metered for consistent neutralization, while the core handles long-life contaminants.
Is the interior antimicrobial?
Yes—silver-infused prefilter and flow path resist bacterial growth and biofilm.
Will it fit my shower arm?
Yes, standard ½" NPT.
Lifetime Hardware Warranty
Every Monolith is built so well it will outlive you. We stand behind our craftsmanship with a lifetime warranty on all hardware components.
Covered: All metal components, housing, internal mechanisms, spray face, and structural elements
Not covered: Consumable filter cartridges and Vitamin-C capsules (designed to be replaced)
Complete Peace of Mind
Lifetime Hardware Warranty
Built so well it will outlive you (excludes consumables)
60-Day Satisfaction Guarantee
Easy returns if not completely satisfied
Carbon-Neutral Shipping
Environmentally responsible delivery
Real User Results
Independent testing and user feedback from the first 6 months.
Report significantly improved water feel and quality
Notice less dryness and irritation within 2 weeks
Report softer, less tangled hair after showering
Average time to install without tools
Users would recommend to friends and family
No noticeable reduction in shower pressure
Third-Party Lab Testing
Independent water quality testing shows consistent performance across different water sources and conditions.
Performance claims use 'reduce/target' language. Results vary with water chemistry, temperature, and flow. Publish independent lab testing as it becomes available. Cuiven and Monolith are trademarks of Cuiven.