Whole-house systems
SMART Whole House Water Filter (9-13 GPM)
Compare media size, service flow and standalone or combination packages.
From $1,791.00 USD snapshot
View detailsGood water starts
with the right fit.
Find your Crystal Quest system, understand the options, and keep the right replacement on hand.
Elorova may earn a commission when you buy through our links. Our guides are based on published documentation, not hands-on or laboratory testing. About our links
What would you like to filter?
Start with where you need treatment. If you already know the model, search the full catalog.
Every tap in your home
Compare SMART, Eagle and High Flow systems by media, flow and configuration.
Drinking water at the sink
Make sense of the 16 Thunder models, their cartridges and pump options.
A plan for your well water
Start with a water test, then match iron, sediment, hardness and other concerns.
Hard water & scale
Understand salt-based softening and salt-free conditioning before choosing.
Your shower & bath
Check fixture fit, cartridge requirements and the limits of published claims.
The right replacement
Look up your system, part number and cartridge size before reordering.
A system for the bigger picture.
Whole-house treatment, drinking-water RO and softening do different jobs. Compare the requirement before the equipment.
Under-sink RO · Thunder
The Thunder under-sink RO family
A starting point for comparing the 16 Thunder under-sink RO models.
Explore the options
Whole-house systems
Plan a well-water system
An iron-treatment option to discuss after testing your well water.
Explore the options
Whole-house systems
Softener or salt-free conditioner?
Salt-based hardness removal, with pre- and post-filter maintenance to plan.
Explore the optionsSmall changes. Ongoing care.
For your shower, bath or an existing system, the right fixture and cartridge matter more than a similar-looking photo.
Shower & bath
Shower Filter
Choose the finish and whether you need the shower head included.
From $40.95 USD snapshot
View details
Shower & bath
Bath Ball® Filter
A hanging filter for a compatible tub spout, with its own replacement cartridge.
From $64.95 USD snapshot
View details
Replacement filters & media
Find your shower replacement
Match the single cartridge or multipack to your shower filter.
Explore the options
Replacement filters & media
Match your system cartridge
Compare cartridge dimensions and package size before reordering.
Explore the optionsFind a cartridge by model or SKU ↗
All prices are USD snapshots from November 8, 2026, not current offers.
Different needs. Different starting points.
On a small screen, scroll the comparison sideways.
| Your starting point | Explore | Check before choosing |
|---|---|---|
| Several taps in the home | Whole-house filters | Incoming water, service flow, plumbing space and maintenance |
| Drinking & cooking water | Thunder under-sink RO | Feed pressure, cabinet space, drain, tank and electricity where required |
| A private well | A test-led treatment plan | Iron, manganese, hardness, pH and the full test panel your situation needs |
| Hardness or scale | Softener vs conditioner | The outcome you need and the feed-water limits for the model |
| An existing system | Replacement finder | Model, part code, dimensions, stage and package quantity |
Look beyond the starting price.
Make the whole plan visible.
Allow for installation, replacement cartridges or media, and any drain, power or additional treatment your water requires. A standalone system and a package with a tank or softener are different purchases.
Ask the question that changes the choice.
What exactly is in this configuration, what evidence supports the claim you care about, and which parts will you need to maintain it? Our checklist helps you take those questions to Crystal Quest or your installer.
Before you order.
The equipment price is one part of the decision. Check the terms for your item and destination.
Shipping & location
Eligible residential orders of $150 or more ship free to residential addresses in the lower 48 US states. Exclusions, freight services and destination fees can apply. Confirm Canadian delivery costs and terms before ordering.
Check shipping termsReturns have exclusions
Eligible returns require approval and an RMA within 30 days, with the item new, unused and uninstalled. RO systems, cartridges, membranes, custom, commercial and international orders are excluded. Fees may apply.
Read the return policyWarranty & performance
A limited warranty, return eligibility and the manufacturer’s conditional performance guarantee are different policies. Ask which applies to your exact model and installation.
Read the limited warrantyPolicies reviewed November 8, 2026. Confirm current model-specific terms with Crystal Quest. Links to the merchant may earn Elorova a commission.