Flow is how much, at once.
GPM means gallons per minute. Consider fixtures used at the same time, source pressure and installation—not bathroom count alone.
01
Sediment + scale02
MicronGuard™03
Carbon finishing
Sediment + scale02
MicronGuard™03
Carbon finishing
Purative™ by Water & Wellness
Orders openPurative Home Max
Maximum Purative capacity for homeowners who want the largest cartridge platform.
Home Max uses larger 4.5″ × 20″ cartridges to provide the greatest reference capacity in the Purative family with 20–40 GPM operating flow for higher simultaneous demand.
$4,500.00
20–40 GPMOperating flow
25,000 galReference capacity¹
Greater capacity and a 20–40 GPM operating flow range for higher simultaneous demand.
Available to order
Ships from Water & Wellness 14–21 days after ordering. Delivery transit time is additional.
Payment is collected at checkout. Shipping and taxes are calculated at checkout. Professional installation is arranged separately.
Fulfilled by Water & Wellness · Professional installation recommended
Operating ranges differ from contaminant-reduction test flows. ¹ Capacity is a reference value from the underlying system documentation; cartridge life varies with water quality and use.
MicronGuard™ technologySalt-free scale management4.5″ × 20″ cartridge formatNo power connection
Find your fit
Choose Max for capacity.
Home Max is the largest Purative cartridge platform.
It is for customers who want the highest reference capacity in the lineup while retaining the same three-stage whole-home treatment philosophy.
- customers prioritizing greater cartridge capacity
- larger-format installations
- households that want the largest Purative system
System details — Home Max
| Purative model | PWH-M4520 |
|---|---|
| Housing format | 4.5″ × 20″ |
| Treatment format | Three-stage point-of-entry |
| Operating flow | 20–40 GPM |
| Reference capacity¹ | 25,000 gallons |
| Replacement set | Purative Max Replacement Filter Set |
| Replacement price | $795.00 |
| Dimensions | 24.25 W × 27.5 H × 7.5 D inches (housing only; excludes valves) |
| Weight | 50 lb packed shipping weight; dry weight not provided |
Choosing your Purative
Size for demand. Plan for care.
Home Essential offers 5–10 GPM, Home Plus 10–20 GPM, and Home Max 20–40 GPM operating flow. Choose based on simultaneous water demand, source pressure, and installation conditions.
Capacity is water treated over time.
Reference gallon capacity helps compare models. It is not a guarantee of months between filter changes.
On a small screen, swipe the comparison to see all three systems.
| Compare | Home Essential | Home Plus | Home Max |
|---|---|---|---|
| Cartridge format | 2.5″ × 10″ | 2.5″ × 20″ | 4.5″ × 20″ |
| Operating flow | 5–10 GPM | 10–20 GPM | 20–40 GPM |
| Reference capacity | 6,000 gallons | 12,000 gallons | 25,000 gallons |
| System price | $1,295 | $2,995 | $4,500 |
| Matched replacement set | $349 | $490 | $795 |
| What changes | Compact format for lower simultaneous demand | More flow and capacity than Essential | Larger cartridges and greater capacity than Plus |
| Explore | View Essential → | View Plus → | View Max → |
Make room for installation.
Cartridge format is not the assembled system’s dimensions. Before purchase, review the model’s installed dimensions, connection size and cartridge-change clearance with your installer.
Budget beyond the system.
Installation is arranged separately. Your water may need additional treatment. Replacement timing depends on water quality, usage and model-specific service guidance.
Operating flow ranges differ from contaminant-reduction test flows. Reference capacities relate to the underlying system documentation. Confirm model selection and applicable performance details for your water.
Not sure where to start?
Explore public water-system records and a practical next step for your household.
A health-first approach
More capacity. The same standard for the water throughout your home.
Max is not about adding more stages or making bigger marketing claims.
It is about giving the same Purative treatment philosophy more cartridge capacity.
How Purative works
Three stages. Three different jobs.
01 / Sediment + scale management
Captures larger sediment and helps manage scale before the advanced stages.
02 / MicronGuard™
Advanced high-surface-area filtration media forms the core of the system.
03 / Carbon finishing
The final carbon stage supports applicable reduction claims and finishes the treatment before water moves through the home.
Designed with intention
The water your family uses every day.
Home Max gives Water & Wellness a higher-capacity Purative option without changing the core philosophy:
treat the water at the point of entry, demand proof for contaminant claims, and keep the system practical enough to live with.
Point-of-entry installation
A larger system that still lives on the wall.
Home Max uses larger cartridge housings but retains the same wall-mounted point-of-entry architecture. Plan adequate service clearance for the 4.5″ × 20″ cartridges.
Ask about installation ↗- Professional installation recommended
- Isolation valves and a service bypass
- Clearance for cartridge changes
- No routine regeneration drain or electronic regeneration controller for the base cartridge system
- Private wells need a water review before system selection
Main water supply
Normal filtration pathInlet isolation valvePurative systemOutlet isolation valve
Service bypassDedicated bypass valveRoutes untreated water around the filters during service.
Water to your home
Conceptual layout. Follow the supplied installation instructions for your complete configuration, accessories and local plumbing requirements.
Performance documentation
Know what has been tested.
Our whole-home systems use a filtration platform with documented performance for specific configurations. Here is what the current IAPMO documentation supports.
Confirmation of the exact Purative-branded configuration is still pending; the claims below describe the underlying systems covered by the documentation.
| What is reduced | What it means | Test standard |
|---|---|---|
| Chlorine, taste & odor | Reduction of chlorine and associated taste and odor under the listed test conditions. | NSF/ANSI 42 |
| Class I particulate | Fine-particle reduction. This is not a bacteria, virus or cyst certification. | NSF/ANSI 42 |
| Total PFAS | The specific Total PFAS reduction claim in the listing. It does not establish removal of every PFAS chemical or complete removal at every concentration. | NSF/ANSI 53 |
Materials safety and lead content
NSF/ANSI/CAN 61 addresses materials safety for the listed components in cold-water use (23°C).
NSF/ANSI/CAN 372 addresses lead content in the product’s materials. It is not a lead-removal claim.
What these certificates do not establish
These whole-home model tables do not list reductions for chloramine, lead in water, other heavy metals, bacteria, viruses, cysts, spores, pharmaceuticals, pesticides or VOCs/THMs. Technology-level testing is separate from model-specific certification.
Purative is not a traditional water softener. Filtration does not establish hardness-mineral removal. Follow local water advisories; do not rely on filtration alone to make microbiologically unsafe or unknown-quality water safe.
Performance documentation and applicable certificates are available on request. Our team can help explain the documentation for the system you are considering.
Request performance documentation ↗Documentation reviewed October 16, 2026. Certification applies to the listed configurations and claims.
Filter care
Matched to Home Max.
The Purative Max Replacement Filter Set is designed for the PWH-M4520 / 4.5″ × 20″ system.
$795.00
Ask about replacements ↗Before you choose
Clear answers. A practical next step.
Purative provides whole-home filtration at the main water line. AquaTru provides reverse-osmosis purification for drinking and cooking water.
Start my water assessment →What is the difference between filtration, softening and RO?
Filtration targets specific particles and contaminants. A conventional softener removes hardness minerals through ion exchange. Reverse osmosis reduces dissolved solids for drinking and cooking water. Purative combines filtration and scale management; it does not replace a softener when soft water is the goal.
If I choose Purative, do I still need AquaTru?
It depends on your water and goals. Purative provides whole-home filtration. AquaTru adds reverse osmosis at the kitchen for drinking and cooking water. You may choose either approach or both; a water review can help you decide.
When will my Purative system ship?
Purative systems ship from Water & Wellness in 14–21 days after ordering. Delivery transit time is additional. Payment is collected at checkout. A water review is optional and does not place an order.
What comes with Purative, and who installs it?
Purative uses a three-stage cartridge assembly. Before you order, we’ll walk through the exact package contents and the plumbing parts your installation needs. Professional installation is recommended at the main water line, with isolation valves, a service bypass and room to change cartridges. Water & Wellness fulfills the system order; installation is arranged separately.
How much should I budget?
Current listed system prices are $1,295 for Home Essential, $2,995 for Home Plus and $4,500 for Home Max. Matched replacement sets are listed at $349, $490 and $795 respectively. Plan separately for installation and any additional treatment your water requires. Final shipping, tax and order details will be provided before purchase.
How often will I replace Purative filters?
Replacement timing depends on water quality, usage and model-specific service guidance. Reference gallon capacity is not a guaranteed calendar interval. We’ll review care requirements before purchase; replacement-set ordering is not open yet.
What if I have well water, heavy scale or an existing softener?
Start with a water review. Tell us about your source water, concerns and existing treatment. Keep any existing treatment in place until the proposed setup has been reviewed for your water and installation.
The complete water home
Purative for the house. AquaTru for the glass.
Purative provides whole-home filtration at the main water line. AquaTru provides reverse-osmosis purification for drinking and cooking water.
Your home. Your water.
Let’s make sure you choose the right system.
Tell us about your home and water source. We can help compare sizes, discuss installation and help you prepare to order.
Complimentary review. No obligation.
A water review is optional. Submitting this form does not place an order or collect payment.