KST-XYB101 Gravity Water Filter Review: Uses a 3-Stage Gravity Filtration System With NSF/ANSI 42 & 372 Certification

Where the KST-XYB101 Fits

KST-XYB101 Gravity Water Filter draws water through 0.01 m filtration for you if you want a stainless-steel countertop unit with NSF/ANSI 42 & 372 certification.

If your kitchen needs a stainless steel gravity water filter, the material matters because it changes the build you bring to the counter.

KST-XYB101 uses stainless steel construction and pairs it with a 0.01 m filtration rating and NSF/ANSI 42 & 372 certification. That makes it a fit for buyers who want a gravity filter with stated filtration standards and a metal housing.

We screened 28 Gravity Water Filters and this is one of 15 chosen for a full review. Full reviews go to the most-rated products that pass screening, at most 2 per brand. This one has 88 buyer ratings, the 15th most of the 28 screened. This review is for you if you want a gravity water filter and need the spec details that decide fit.

You might also consider the full spec breakdown of the Big+.

The Short Answer on the KST-XYB101

Best for: You need a countertop gravity filter with NSF/ANSI 42 and 372 certification, and you want a stainless steel build with a stated 0.01 m filtration figure.

Choose the KST-XYB101 if that is your setup, and expect to pay around $119.99.

• Pro: The stainless steel body matches the material listed on 24 of the 28 screened gravity filter listings.
• Pro: The 5,000-gallon carbon filter capacity gives you a long replacement interval on paper.
• Con: The 1-gallon size is smaller than larger countertop options, so it suits lighter daily use better than a high-demand household.
• Con: The listing does not state flow rate, so you cannot judge how quickly it will refill the lower chamber.

Don’t buy this if: you need a countertop gravity filter with a stated pore size at or below 0.2 µm for a bacteria-and-protozoa target.

Price assessment: Around $119.99 is fair for the stated certification, stainless steel construction, and 5,000-gallon filter capacity.

Researching your options? View our guide to the best gravity water filter for travel.

The Specifications That Matter for this Gravity Water Filter

Filter pore size most separates the KST-XYB101 1G from other gravity water filter options. It measures the size of the openings that limit what particles can pass through.

Performance: What the Specs Deliver

How the 3-Stage Gravity Filtration System Performs

KST-XYB101 holds water for a household batch, and the 3-stage setup suits a reader who wants one fill to cover more than a quick glass. The listing does not state a tank size, so refill frequency cannot be pinned to a number here. What the data does give is a gravity-fed format with a 0.01 m pore size, which points this filter toward fine particulate removal rather than simple sediment straining alone.

Think of it like a kitchen sieve with much finer holes than a colander; the smaller opening changes what stays behind, not how much sits in the bowl. Because the storage figure is not stated, you should treat capacity as unknown and plan around the lower chamber size only if another section gives that number.

Certified Material Safety

KST-XYB101 uses austenitic 18/8 stainless steel and carries NSF/ANSI 42 & 372 certification, so the material and the standard both matter if you want a countertop gravity filter for treated household water. NSF/ANSI 42 covers chlorine, taste, and odor claims, while NSF/ANSI 372 addresses lead content compliance in drinking-water contact materials. That gives you a clearer basis for choosing this model when material contact and basic water-quality claims both matter.

The stainless steel body also helps if you want a filter that sits in a damp kitchen without relying on plastic housing for the main shell. The transparent water level window adds a practical check on fill level, which matters more when you are using a gravity-fed system and want to see remaining water at a glance. The listing does not state chamber capacity, so the safety story is about material and certification, not about how many refills your household will need.

What a 5,000-gallon carbon stage means for service life

KST-XYB101 states a black carbon filter capacity of up to 5,000 gallons, so the carbon stage supports long service before replacement becomes the main concern. That is the figure that matters if you want fewer cartridge changes over time, especially in a household that uses filtered water every day. The filter components include coconut shell activated carbon, a silver ion membrane, and medical-grade hollow fiber ultrafiltration membranes.

The 5,000-gallon figure is about service life, not storage, so it changes maintenance planning rather than batch size. The 0.01 m filtration claim belongs to the pore size, while the carbon capacity tells you how long the black element is rated to keep working at that level. If you want a gravity filter that reduces refill hassle through longer cartridge life, this is the number to watch; if you want to know how much water it holds at once, that figure is not stated here.

How the KST-XYB101 Compares to Other Gravity Filters

KST-XYB101’s clearest edge is its 0.01 m filter pore size, paired with a $119.99 price and a 4.4 average from 88 buyer ratings. That combination gives you a fine opening size without pushing this gravity water filter into the higher price tier.

• Against the Purewell K8675 1.5G Water Filter, the KST-XYB101 costs about $1 more, so price is not its advantage there.
• US Water Filters SSGR2.25-CB-PF lists stainless steel too, and both products state that material. The difference comes from the filter pore size: KST-XYB101 states 0.01 m, while that model does not state a matching figure here.
• Gravity-Fed Water Filter System is priced around $129, so the KST-XYB101 sits below it on cost by $9.01.
• Purewell Gravity Water Filter System also states 0.01 m, so the pore-size line is a tie. Its $109 price is lower, which makes it the better pick if upfront cost matters most.

If you want the lowest price and can accept a tied pore-size figure, choose the Purewell Gravity Water Filter System. If you want the stronger buyer-rating position in this set, KST-XYB101 ranks first at 4.4 from 88 ratings.

From Delivery to First Use with This Gravity Water Filter

What you need before the KST-XYB101 can filter water

The KST-XYB101 needs its filter element installed before it can do anything useful.

1. Unpack the stainless steel body and identify the Black filter element PM-2.
2. Fit the filter element into the housing so the 0.01 m filtration stage is in place.
3. Seat the parts so the 0.83in filter wall thickness does not interfere with assembly.
4. Fill the upper chamber and watch the transparent water level window for the first correct water level.

Getting the wrong element wastes time and can force a return if the 0.01 m stage is not the one you need.

Warranty and support checks for the KST-XYB101

Warranty cover differs by seller and country.

• Confirm whether the replacement filter element is covered separately, because the 5,000-gallon filter life makes it the part most likely to need replacement.
• Confirm whether a spigot gasket is included or sold separately, because outlet leaks would affect a gravity-fed countertop system immediately.
• Confirm whether a priming washer is needed for your filter element, because some elements need that part before first use.
• Confirm whether the fluoride filter element is supported, because the listing only names the standard 3-stage filtration gravity water filtration system.

On arrival, inspect the outlet area first and keep the packaging until the transparent water level window and spigot area are both confirmed intact.

This Gravity Filter: Remaining Questions

Is the $119.99 price worth it for what it does, or am I paying extra for the stainless steel body?

The $119.99 price makes sense if you want NSF/ANSI 42 & 372 certification, a 0.01 m filter rating, and a 5,000-gallon carbon filter capacity. The stainless steel body is part of the package, but the filtration specs do the real work here, and 24 of the 28 screened listings also state stainless steel.

KST-XYB101 is not priced as a bare-bones gravity filter. The transparent water level window, 3-stage filtration, and black filter element PM-2 add practical detail, while the 4.4 average from 88 ratings gives you buyer feedback alongside the spec data. For this category, the question is less about a steel shell and more about whether you want certified gravity filtration with a stated 5,000-gallon element life.

Is the KST-XYB101 Right for You?

Who the KST-XYB101 suits and the jobs it is the wrong choice for, listed below with the reason for each.

Where to Buy This Gravity Water Filter

Gravity water filters are sold by the retailers below – we do not track which of them has the KST-XYB101 in stock, so check availability and the current price with the retailer before making a trip.

• Walmart (online and physical stores) — in-store returns
• Target (online and physical stores) — easy local pickup and returns
• Home Depot (online and physical stores) — in-store returns and broad household category coverage
• REI (online and physical stores) — specialist staff and trusted outdoor-water-filter selection
• Bass Pro Shops (online and physical stores) — specialist staff for camping and emergency water filtration
• The Berkey Store (online only) — specialist retailer for gravity water filters
• Amazon (online only) — breadth of range

If you need a portable solution, see our full review of the Travel Berkey.

Final Verdict on the KST-XYB101

You need a gravity-fed countertop filter with NSF/ANSI 42 and 372 certification, 0.01 m filtration, and room for up to 5,000 gallons of carbon life. KST-XYB101 is a fit at around $119.99.

The 0.01 m filter rating is the key figure here. It is the spec that determines what the filter can physically screen out, and this model pairs it with stainless steel construction and a 5,000-gallon carbon capacity.