LT1000P Replacement (2026): Fit, Reset & Cost Guide
Guide
The “replace filter” light on your LG fridge just turned on, and now you are holding a part number — LT1000P — with no idea which cartridge to buy, whether the cheap compatibles are any good, or how to make that light go away.
Here is the short answer: the LT1000P is LG’s slim internal filter, found across its French-door lineup. LG states that it is tested and certified by NSF International against NSF/ANSI 42, 53, and 401 — which covers chlorine taste and odor, lead and asbestos, plus emerging contaminants such as pharmaceuticals — and it is rated at 200 gallons or 6 months. Swapping it takes a few minutes, the indicator resets with a 3-second button hold, and a year of genuine filters costs roughly $60–80 versus under $40 for a compatible. This guide covers which fridges it fits, genuine vs compatible, the reset steps, and the real yearly math.
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Which LG fridges use the LT1000P
The LT1000P is an internal filter: it lives inside the fresh-food compartment, usually in the top-left corner of the ceiling behind a small cover, and it feeds both the water dispenser and the ice maker. If your LG fridge uses an external filter or a different housing, you need a different part number entirely.
Several part numbers are the same filter under different labels. Any of these on your old cartridge means the LT1000P is the right replacement:
| Part number | What it is |
|---|---|
| LT1000P | Current LG part number |
| LT1000PC / LT1000PCS | Same filter family, per LG’s performance data sheet |
| ADQ74793501 / ADQ747935 | LG system code printed on packaging |
| ADQ75795105 | Alternate LG system code |
| AGF80300704 / AGF80300705 | LG regional part codes |
LG’s performance data sheet lists the LT1000P family against models including the LRFXC2406D and LRFCS25D3S series, but the real list runs much longer. The fastest check is the rating plate inside your fridge or the label on your old cartridge.
- Brand
- LG
- Filter model
- LT1000P
- Type
- Internal refrigerator filter
- Rated life
- 6 months / 200 gallons
- NSF certification
- NSF/ANSI 42, 53, 401 — stated on lg.com
- Covers (brand-stated)
- Chlorine taste & odor; lead & asbestos; pharmaceuticals & pesticides
- Replaces
- LT1000PC, LT1000PCS, ADQ74793501
- Size
- 2.1 × 2.1 × 7.1 in
- Typical genuine price
- ~$30–40 single / ~$50–68 2-pack (estimate)
Samsung owners can run the same model-number lookup in our Samsung DA29-00020B replacement guide, and our Samsung HAF-QIN replacement guide covers Samsung’s wider cartridge.
Genuine vs compatible LT1000P filters
Third-party LT1000P compatibles are everywhere, often at a third of the genuine price. The housings match, the water flows, and most owners report no leaks. So what does the genuine cartridge actually buy you? We researched and compared instead of guessing: the answer is certification.
On lg.com, LG states the LT1000P is tested and certified by NSF International against NSF/ANSI Standard 42 for taste and odor (chlorine, chloramines), Standard 53 for health effects (lead, asbestos), and Standard 401 for incidental contaminants (pharmaceuticals, pesticides) — “to reduce 25 potentially harmful substances including lead.” Some third-party brands also hold their own NSF listings, but most compatibles carry only the maker’s own claims, which is not the same thing.
Genuine LG — pros
- Widest stated certification of the common fridge filters — NSF/ANSI 42, 53, and 401 per lg.com, including lead and pharmaceuticals.
- Exact-fit housing — built to LG’s dimensions, so sealing is never a question.
- Checkable genuine tells — the LG logo on the filter, a hidden LG watermark that appears when you shine a flashlight on the label, and an LG hologram label on the packaging (all per lg.com).
Genuine LG — cons
- 2–3x the price of compatibles — the certification and fit cost real money every six months.
- Counterfeits are common — “genuine” listings at impossibly low prices are usually fakes.
- LG’s own position — LG states that aftermarket filters can cause leaks, malfunctions, and refrigerator damage, and recommends genuine filters.
| Genuine LG | Third-party 3-pack | Third-party single | |
|---|---|---|---|
| Price per filter | ~$30–40 | ~$12–17 | ~$14–18 |
| Rated life | 6 months / 200 gal | 6 months / 200 gal (claimed) | 6 months / 200 gal (claimed) |
| Certification | NSF/ANSI 42, 53, 401 — stated on lg.com | Varies: some NSF-listed, most brand-stated only | Usually brand-stated only |
| Fit | Exact | Matches dimensions | Matches dimensions |
| Best for | Certified filtration and exact fit | Budget rebuy with a listed brand | Trying one before committing |
One reassurance: using a compatible filter does not automatically void your fridge warranty. Under the Magnuson-Moss Warranty Act, a manufacturer generally cannot void coverage just because you used a third-party part — though damage caused by a badly made cartridge is still on you, which is another reason to pick a listed brand.
We ran the same genuine-vs-compatible comparison for Frigidaire’s filters in our WF3CB vs ULTRAWF comparison — the pattern is identical: the genuine cartridge buys you the stated certification, the compatible buys you the savings.
How to replace it and reset the filter light
No tools needed, and it takes a few minutes (following LG’s own instructions):
- Lower or remove the top shelf. If the top shelf sits right under the filter cover, move it so the filter can rotate all the way down.
- Open the cover and remove the old filter. Pinch the sides to open the water filter cover, then rotate the old cartridge down and pull it out. Wrap a cloth around the cover — LG says about an ounce of water drains out during the swap.
- Insert the new cartridge. Remove all packaging and seals, push the new filter up into the housing, and twist it until it locks. A filter that is not fully seated is the number-one cause of slow flow after a swap.
- Flush the dispenser. Run about 2.5 gallons through the water dispenser before drinking. The water may look cloudy at first — that is trapped air and carbon fines from the new cartridge, and it clears as you flush.
- Reset the indicator light. The light does not reset itself, so do this every time: press and hold the Water Filter (on some models labeled Ice Plus Water Filter) button on the control panel for about 3 seconds, until the icon turns off. Button labels vary by model, so check your manual for your exact panel.
- Check for leaks. Look around the filter housing after the first few minutes of use, and reseat the cartridge if you see any dripping.
GE fridges use different buttons for the same job — our GE XWFE replacement guide walks through the GE reset sequence step by step.
Cost per year: genuine vs compatible
The filter is rated at 6 months or 200 gallons, so a normal household buys two cartridges a year. The yearly cost is just two times the per-cartridge price:
| Option | Price per cartridge | Cartridges per year | Estimated yearly cost |
|---|---|---|---|
| Genuine LG (single) | ~$30–40 | 2 | ~$60–80 |
| Genuine LG (2-pack) | ~$25–34 each | 2 | ~$50–68 |
| Third-party 3-pack | ~$12–17 | 2 | ~$24–34 |
| Third-party single | ~$14–18 | 2 | ~$28–36 |
The gap is real: genuine costs about two to three times the compatible per year — roughly $30–45 more annually — for LG’s stated NSF 42/53/401 certification. A 3-pack of compatibles covers a full year with a spare, which is why so many owners buy them in bulk.
Treat every price in this section as an estimate — filter prices move with promotions and sellers, so always check the live price before you buy.
For a second data point on fridge-filter math, Whirlpool’s EveryDrop EDR4RXD1 runs a similar yearly pattern — our EveryDrop EDR4RXD1 replacement guide breaks it down the same way.
Conclusion
The LT1000P is one of the simplest filters to live with: it fits LG’s French-door lineup, swaps in a few minutes, and the indicator light resets with a 3-second hold. Genuine cartridges run roughly $60–80 a year for LG’s stated NSF 42/53/401 certification; a decent compatible cuts that under $40. Buy the genuine if you want the certification and exact fit, buy a listed compatible if you want the savings — and either way, change it on schedule, because a filter you leave in too long is just plumbing.
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FAQs
How often should I replace the LT1000P?
Every 6 months or 200 gallons, whichever comes first — that is the manufacturer’s rated life. Households with poor source water may need to swap sooner: slow dispenser flow or a change in taste are the practical signals. The fridge’s indicator light is a timer, not a sensor, so treat it as a reminder rather than a measurement.
What does the LT1000P replace?
The LT1000P is the current part number for a filter family that also goes by LT1000PC, LT1000PCS, and the LG system codes ADQ74793501, ADQ747935, ADQ75795105, AGF80300704, and AGF80300705. If any of those numbers is printed on your old cartridge, the LT1000P is the right replacement.
How do I reset the LG refrigerator filter light?
Press and hold the Water Filter button (on some models labeled Ice Plus Water Filter) on the control panel for about 3 seconds, until the icon turns off. The light does not reset itself, so do this after every filter change. Button labels vary by model — check your manual for your exact panel.
Are compatible LT1000P filters as good as the genuine one?
For fit, usually yes — the housings match and most owners report no leaks. For certification, that is where they differ: LG states the genuine cartridge is certified by NSF International against NSF/ANSI 42, 53, and 401, including lead and pharmaceuticals, while most compatibles carry only the brand’s own claims. If you buy third-party, pick a brand that appears in the NSF database and be wary of “genuine” listings at impossibly low prices.
Does the LT1000P remove lead?
As a brand-stated claim, yes: LG states NSF/ANSI 53 certification for the LT1000P covering lead and asbestos, and its performance data sheet lists over 99.6 percent lead reduction at both test pH levels. These are LG’s stated figures, not our own measurements. If lead is your concern, test your water first — a test tells you what you actually need to remove.
How can I tell if an LT1000P filter is genuine?
LG gives three checks on lg.com: look for the LG logo printed on the filter, shine your phone flashlight on the label to reveal a hidden LG watermark, and look for the LG genuine hologram label on the packaging. A fourth, unofficial test is price — a “genuine” filter selling for a third of the normal price is almost certainly a fake.
Do I need to shut off the water to change the LT1000P?
Usually not. LG says about an ounce of water drains from the housing during the swap, which is why the manual suggests wrapping a cloth around the filter cover — not shutting off the supply. Your owner’s manual has the final word for your model, and it never hurts to know where your supply valve is before you start.
Why does my water look cloudy after installing a new filter?
Cloudy or grey-looking water right after a swap is normal — it is trapped air and loose carbon fines from the new cartridge. LG’s own guidance says to run about 2.5 gallons through the dispenser to purge the line. If the cloudiness persists after a full flush, remove and reseat the cartridge to make sure it is fully locked in.
