Buying Guides
LG Refrigerator Water Filter Guide: LT700P, LT800P & LT1000P
LG uses three core refrigerator water filters across its modern lineup, and the LT designations make identification easier than most rival brands — once you know which one your fridge takes. The choice usually comes down to model year.
LG’s three main refrigerator water filters are the LT700P (ADQ36006101) for most French-door models from 2009 to 2016, the LT800P (ADQ73613401) for larger-capacity French-door units, and the LT1000P (ADQ74793501) for newer InstaView and Door-in-Door models from approximately 2017 onward. All three carry NSF/ANSI 42 and 53 certifications; the LT1000P adds NSF/ANSI 401. Replace every six months or 200 gallons.
Decoding LG filter part numbers
LG names its filters two ways. The LT-prefix name is the consumer-facing SKU (LT700P, LT800P, LT1000P). The ADQ-prefix number is the engineering part number printed on the cartridge itself. Both refer to the same filter.
| Marketing name | Engineering number | Approximate era |
|---|---|---|
| LT700P | ADQ36006101 | 2009-2016 French door |
| LT800P | ADQ73613401 | 2014 onward, larger capacity |
| LT1000P / LT1000PC / LT1000PCS | ADQ74793501 / ADQ74793504 | 2017 onward InstaView and Door-in-Door |
| LT600P | 5231JA2006A | Older 2007-2012 side-by-side |
| LT500P | 5231JA2002A | Discontinued legacy filter |
If you see an ADQ number on your existing cartridge, match it to the table to find the LT name. If you only have the LT name, you don’t need the ADQ — either identifier is enough to order the right part.
LT700P (ADQ36006101) — the long-running French-door filter
The LT700P has been LG’s most common refrigerator filter for over a decade. It fits an enormous range of French-door models sold from roughly 2009 through 2016, and continues to be the spec’d cartridge for some current entry-level units. The cartridge twists into a housing in the upper-right corner of the fresh food compartment.
Models that use LT700P
- LG LFX, LFXC, LFXS series French doors (2009 onward)
- LG LMX series French doors with bottom drawer freezer
- LG LSXS side-by-side variants (selected models)
- Kenmore Elite French-door models built by LG (look for “Made in Korea” and a model starting with 795) — see our Kenmore replacement filters for direct fits
NSF certifications
LT700P carries NSF/ANSI 42 and 53. The certified contaminants include:
- Chlorine taste and odor
- Particulates Class I
- Lead
- Mercury
- Cysts (cryptosporidium, giardia)
- Select VOCs and pesticides
Capacity is rated at 200 gallons or six months, whichever comes first.
LT800P (ADQ73613401) — larger capacity French door
LT800P appeared around 2014 for LG’s larger-capacity French-door models — generally units with more interior volume and higher dispenser flow rates. It carries the same NSF 42 and 53 certifications as LT700P but with a different cartridge body and housing.
Models that use LT800P
- LG LMXS, LMXC counter-depth French door (selected 2014+ models)
- LG LFXS larger-capacity French door (selected 2014+ models)
- Kenmore Elite variants in the same generation
Capacity is rated at 200 gallons or six months.
LT1000P (ADQ74793501) — InstaView and Door-in-Door
LT1000P is LG’s current top-tier filter, used in newer InstaView refrigerators (the ones with the glass panel that lights up when you knock) and Door-in-Door models from approximately 2017 onward. It’s the only one of the three that adds NSF/ANSI 401 to its certifications.
NSF certifications
- NSF/ANSI 42 — chlorine taste and odor
- NSF/ANSI 53 — lead, mercury, cysts
- NSF/ANSI 401 — pharmaceuticals, BPA, pesticides, certain PFOA/PFOS chemistries
That 401 mark is the differentiator. If you have an InstaView fridge and you’re concerned about emerging contaminants, LT1000P is doing meaningful work that LT700P and LT800P are not.
Models that use LT1000P
- LG LRMVS, LRMDS InstaView Door-in-Door (2017 onward)
- LG LRFVS, LRFDS InstaView Craft Ice models
- LG LRMXC, LRMXS counter-depth InstaView (recent years)
- Kenmore Elite InstaView equivalents
LT1000PC and LT1000PCS are variant SKUs sold in different retail channels — same cartridge, different packaging.
Don’t forget the air filter: LT120F
LG is one of the few brands that pairs a water filter with a dedicated fresh food compartment air filter, the LT120F. It sits in a small housing inside the refrigerator (often on the back wall) and absorbs odors that build up between filter changes.
LT120F has no NSF certification because it’s not in the water path, but it does meaningfully reduce smells when replaced every six months. Most owners ignore it entirely — and pay for it with persistent food odor when they open the door. If you’re already buying a water filter, picking up the air filter at the same time is a small upgrade.
OEM vs certified compatibles for LG fridges
LG OEM filters typically run $45 to $60 (LT700P, LT800P) or $50 to $70 (LT1000P). NSF-certified aftermarket equivalents usually retail at $20 to $30. The chemistry is identical when the certifications match.
LG twist-in housings are generally tolerant of aftermarket cartridges — fit issues are less common than with some Samsung housings. The bigger question with LG compatibles is which NSF certifications the aftermarket version carries. Some “LT1000P compatible” cartridges include only NSF 42 and 53, dropping the 401 certification that makes the OEM stand out. If 401 matters to you, verify it specifically on the aftermarket spec sheet.
Buying a compatible LG filter — checklist
- Verify your existing cartridge name (LT700P, LT800P, LT1000P) before ordering.
- Confirm NSF/ANSI 42 and 53 certifications are listed with a named certifier (NSF, WQA, IAPMO).
- If matching LT1000P, look for NSF/ANSI 401 explicitly listed — not implied.
- Capacity should be 200 gallons / 6 months minimum.
- Compatibility list should name the exact LT and ADQ part numbers, not just “fits LG fridges.”
Installing an LG refrigerator water filter
LG cartridges use a quarter-turn twist mechanism. The process is identical for LT700P, LT800P, and LT1000P.
- Open the fresh food compartment and locate the filter housing — upper-right corner for most models.
- Grip the existing cartridge and rotate counterclockwise about a quarter turn. It will release.
- Pull the old cartridge straight down (twist-in models) or out (push-in style). Have a towel handy for the small amount of water that drips.
- Remove the protective caps from the new cartridge.
- Align the new cartridge with the housing slot, push it up into place, and rotate clockwise about a quarter turn until it locks.
- Dispense at least 2.5 gallons of water through the dispenser to flush trapped air and carbon dust. Pour slowly — fast pours create more air bubbles.
- Reset the filter indicator. On most LG models, hold the Filter button on the dispenser panel for three to five seconds until the indicator changes color.
If you have an LG with the older push-in style cartridge (some legacy LFX models), the install motion is straight in instead of twist — push firmly until it clicks, then flush.
Common LG filter questions and pitfalls
Cartridge won’t lock in place
The alignment notch isn’t engaged. Pull the cartridge back out, line up the arrow on the cartridge with the matching mark on the housing, then push in and rotate. Don’t force it — if it doesn’t turn smoothly, it’s not aligned.
Water tastes worse after install
Carbon dust in the first gallon. Flush three gallons in slow pours and the taste will normalize. If it still tastes off after five gallons, there may be unrelated plumbing issues upstream — check the saddle valve and water line.
Indicator won’t reset
On many LG models the reset is a long-press of three to five seconds, not a tap. If a press doesn’t work, try the Lock or Filter button (model-dependent). On Wi-Fi-connected ThinQ models, you can also reset through the app.
Bottom line
Identify your LG cartridge by the LT or ADQ number on the existing filter, match it to the correct replacement (LT700P, LT800P, or LT1000P), and replace every six months. For most owners, LT700P is the right call — it covers a decade of French-door models. InstaView and newer Door-in-Door fridges need LT1000P, which is the only one of the three carrying NSF/ANSI 401.
Certified aftermarket cartridges from a reputable maker perform identically to the OEM at meaningful savings, provided the NSF certifications match exactly — especially the 401 if you’re replacing an LT1000P.
Frequently asked questions
What’s the difference between LT700P and LT1000P?
LT700P fits most LG French-door fridges from 2009 to 2016 and carries NSF/ANSI 42 and 53 certifications. LT1000P fits newer InstaView and Door-in-Door models from approximately 2017 onward and adds NSF/ANSI 401 (pharmaceuticals, BPA, pesticides, certain PFOA/PFOS) to the 42 and 53 base. They are not interchangeable; the housings are different.
Are LT1000P, LT1000PC, and LT1000PCS the same filter?
Yes. All three are the same physical cartridge sold under slightly different SKUs through different retail channels. The engineering part number is ADQ74793501 (or ADQ74793504 for a minor revision). Any of them will fit any LT1000P-spec’d LG fridge.
How often should I replace my LG refrigerator water filter?
Every six months or 200 gallons, whichever comes first. The fridge’s filter indicator estimates remaining life based on flow and time. Hard water or sediment can shorten that to four months. The activated carbon’s bacteriostatic capacity degrades over time regardless of flow, so don’t stretch past six months even if you’re a light user.
Do I need to replace the LG air filter too?
The LT120F air filter is separate from the water filter and sits inside the fresh food compartment. It’s not NSF-certified because it’s not in the water path, but it reduces food odors that build up between changes. Replacing it every six months alongside the water filter is a small upgrade most owners overlook.
Can a certified aftermarket filter replace my LG OEM?
Yes, provided the aftermarket cartridge carries the matching NSF/ANSI certifications listed with a named certifier (NSF International, WQA, or IAPMO). If you’re replacing an LT1000P, verify the aftermarket version specifically lists NSF/ANSI 401 — some compatibles drop that certification, which is the main thing distinguishing LT1000P from LT700P and LT800P.
Find the right cartridge for your LG fridge in our LG refrigerator water filters section, organized by LT number and model year. Free US shipping on every order, and our full range of water and air filtration covers everything else in the home.
