No water sent to a drain
This is a direct filtration system, so it does not create the reject-water stream associated with reverse osmosis.
Independent non-RO under-sink guide
Aquasana AQ-5300+ Buying Guide
A certified three-stage Max Flow system for households that want stronger drinking-water filtration without a storage tank, drain connection, reject water, or electrical outlet.
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Original editorial image, not an exact product photograph.
The short versionChoose it when you want documented contaminant reduction and a dedicated filtered-water faucet but do not need reverse osmosis for dissolved minerals or salts.
Exact-model research Ownership planning Updated October 17, 2026
The purchase decision
Serious under-sink filtration without the baggage of reverse osmosis.
The AQ-5300+ is a strong fit for a household on treated municipal water that wants a dedicated filtered-water faucet and a clear certification trail but does not want an RO tank, drain saddle, electrical outlet, or reject-water stream. It keeps water flowing through a compact three-stage system while retaining the source water's dissolved minerals.
See the system
Start with the job it does, the space it needs, and the filters it requires.
The Max Flow set combines a sediment pre-filter with two Claryum filter elements. The exact replacement is AQ-5300+R or AQ-C3M-R. The plus sign matters because the standard AQ-5300 uses a different 600-gallon set.
- Rated capacity
- 800 gallons
- Rated flow
- 0.72 GPM
- Operating range
- 20 to 80 psi
AQ-5300+ at a glance
A practical choice when its treatment style matches the actual water problem.
You get filtered water at a separate faucet without waiting for a storage tank to refill, and there is no reject water going down the drain. The 0.72 GPM rated flow is useful for glasses, bottles, coffee, and normal cooking, though it will not feel like the full flow from the main kitchen faucet.
Avoid it when your actual goal is reducing total dissolved solids, fluoride, nitrate, sodium, or other concerns that call for a properly selected reverse-osmosis system. It is also not for untreated microbial risk or water of unknown safety without appropriate disinfection.
Everyday benefits
What this system could make easier in a real kitchen.
These benefits come from the published design, specifications, and maintenance requirements. They are not firsthand test results.
No tank or power outlet
The three housings mount beneath the sink and feed a dedicated faucet without a pressure tank, pump, or electrical connection.
Claim-specific certification trail
Aquasana publishes model-specific performance information for standards 42, 53, and 401, plus P473-related claims. Read the exact sheet for the contaminant that matters.
One set, one main schedule
The AQ-5300+R replacement set includes the three filter elements and follows a six-month or 800-gallon limit, which is easier to plan than staggered RO stages.
Read the exact claim scope
Model-specific documents matter more than broad marketing language.
Aquasana's current AQ-5300+ performance material names NSF/ANSI standards 42, 53, and 401 and P473-related claim testing for the exact model. Certification does not mean the system reduces every contaminant. Match each concern to the named claim and use genuine certified replacement elements when relying on that result.
Aquasana lists replacement at 800 gallons or about six months. Actual timing depends on use, sediment, and water conditions.
This is the dedicated filtered-water faucet flow from the performance sheet, not the flow of the main kitchen faucet.
The official manual also lists a 40°F to 90°F water-temperature range and cold-water use only.
Claims belong to the exact system and filter
Use the current performance sheet or certification listing for the named model. Do not transfer a claim to a related model, third-party cartridge, private well, or unknown water source without supporting documentation.
Check the official documentation (opens in a new tab)Installation reality
Simpler than RO, but it still needs a separate faucet and service room.
The system connects to the cold-water line and feeds a dedicated faucet. There is no drain saddle, tank, or outlet, but the cabinet still needs a firm mounting location and enough room below the housings to remove and open them during service.
5fit checks before orderingMeasure first and leave room for service.
Cold-water connectionDedicated faucet openingStable mounting surfaceHousing removal clearance20 to 80 psi supply
Review the current manual before drilling or changing plumbing. Use a qualified plumber when the shutoff valve, drain, sink material, faucet opening, water pressure, or local code makes the installation uncertain.
Cost of ownership
The replacement plan belongs in the buying decision.
Filter life depends on the manufacturer limit, water quality, and household use. Set aside maintenance money before choosing the system, and buy by exact part number.
The complete three-element set includes the sediment stage and both Claryum filters. Replace at the first limit reached.
Aquasana states that the lower filter housings should be replaced on a five-year schedule to reduce leak risk.
Check the current seller price when you are ready to buy. We do not show a fixed annual dollar total because promotions, shipping, use, and early replacement can change it.
As an Amazon Associate I earn from qualifying purchases.
Exact-model buying path
Replacement filters for the Aquasana AQ-5300+
The replacement page includes current fit notes, the part number, and the Amazon buying option.
Compare before buying
Choose the treatment style, not only the most impressive specification.
These alternatives solve different household problems. The right choice depends on your water, available space, installation tolerance, and maintenance preference.
| System | Best reason to choose it |
|---|---|
| APEC ROES-50 | Choose for traditional tanked reverse osmosis when dissolved-solids reduction is a core need and cabinet space is available. |
| Waterdrop G3P600 | Choose for a slim powered tankless RO system with higher nominal output and model-specific cartridges. |
| AquaTru countertop systems | Choose for reverse osmosis without an under-sink installation, accepting counter space and batch refilling. |
Decision guide
Best for some kitchens, unnecessary for others.
Consider the AQ-5300+ if
- You use treated municipal water and want stronger point-of-use filtration.
- You want no storage tank, drain connection, electricity, or reject water.
- You value exact-model certified reduction claims.
- A 0.72 GPM dedicated faucet suits your daily use.
- You are comfortable replacing the set every six months or 800 gallons.
Avoid it if
- ×You need reverse osmosis for a dissolved-solids concern identified by appropriate testing.
- ×You want filtered water through the main kitchen faucet instead of a separate faucet.
- ×Your cabinet cannot provide mounting and housing-removal clearance.
- ×You plan to substitute the standard AQ-5300 filter set for the Max Flow set.
- ×Your water is microbiologically unsafe or of unknown quality without adequate disinfection.
Questions before buying
Aquasana AQ-5300+ FAQ
Is the Aquasana AQ-5300+ a reverse-osmosis system?
No. It is a three-stage direct filtration system. It does not use an RO membrane, storage tank, drain connection, or reject-water stream.
What is the AQ-5300+ flow rate?
The official performance sheet lists a rated service flow of 0.72 gallons per minute through the dedicated filtered-water faucet.
How often are AQ-5300+ filters replaced?
Aquasana lists the AQ-5300+R replacement set for up to six months or 800 gallons, whichever comes first. Water conditions and use may require earlier service.
Can I use the standard AQ-5300 replacement set?
No. The AQ-5300+ Max Flow system uses AQ-5300+R or AQ-C3M-R. The standard AQ-5300 uses a different replacement set, so confirm the plus sign on the system.
Did Find My Water Filter personally test the AQ-5300+?
No. This guide is based on current manufacturer performance and installation documents plus the exact Amazon listing. It does not present firsthand results.
Research record
What this guide uses.
This is a research-based buying guide built from current manufacturer material and exact Amazon listings. It is not a firsthand product test. Specifications, packages, prices, certification listings, and availability can change.
Ready to compare the current offer?
Confirm the model, faucet finish, cabinet fit, package contents, and replacement plan first.
Then review the current seller, return terms, warranty, availability, and checkout total.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases at no additional cost to you.