LG LT1000P Water Filter: Complete Replacement Guide + Best Compatible Options (2025)
LG LT1000P Water Filter: Complete Replacement Guide + Best Compatible Options (2025)
If you own an LG French door, side-by-side, or bottom-freezer refrigerator made after 2018, the LG LT1000P is almost certainly your filter. It is the most popular LG replacement filter on the market — and also one of the most unnecessarily expensive at the OEM price of around $45, when NSF-certified compatible alternatives perform identically for under $20.
This guide covers everything: what the LT1000P is, which LG models it fits, exactly how to install it, the part number confusion that trips up thousands of buyers, and how to save over 50% without sacrificing a drop of water quality.
Also known as: ADQ74793501, LT1000PC, MDJ64844601 | Type: Twist-in internal | Location: Upper right of fridge interior | Life: 6 months / 200 gallons | Certifications: NSF/ANSI 42 and 53
What Is the LG LT1000P Water Filter?
The LT1000P is LG’s current-generation internal refrigerator water filter, introduced in 2018 as the successor to the LT700P. It uses a quarter-turn twist-in mechanism and mounts in the upper right interior of the refrigerator compartment. The activated carbon block media is certified under NSF/ANSI 42 and 53 to reduce over 30 contaminants including chlorine, lead, and cysts.
LG sells this filter under two names — LT1000P (consumer-facing) and ADQ74793501 (engineering part number). Both refer to the exact same filter. LT1000PC is a newer revision — also fully interchangeable.
These three LG filter generations are NOT interchangeable. The LT1000P (2018+) has different dimensions and thread pattern from the LT700P (2014–2018) and LT800P (2016–2020). Installing the wrong generation will result in a filter that will not seal, causing leaks or no water flow. Check your existing installed filter label to confirm your generation.
Which LG Refrigerators Use the LT1000P?
The LT1000P fits LG refrigerators from 2018 onwards. The fastest confirmation: look at the label on your currently installed filter. If it reads LT1000P or ADQ74793501, this guide is for you. Use our Filter Compatibility Checker for a guaranteed model-number match.
| LG Series | Model Prefix Examples | Type | Years |
|---|---|---|---|
| LRMVS Series | LRMVS3006S, LRMVS3006D | French Door | 2018–present |
| LRFXS Series | LRFXS2503S, LRFXC2426S | French Door | 2018–present |
| LSXS Series | LSXS26326S, LSXS26386S | Side-by-Side | 2018–present |
| LRFDS Series | LRFDS3016S, LRFDS3016D | French Door | 2019–present |
LG LT1000P Full Specifications
| Specification | Details |
|---|---|
| Part Numbers | LT1000P, ADQ74793501, LT1000PC, MDJ64844601 |
| Filter Type | Twist-in internal, activated carbon block |
| Location | Upper right interior of refrigerator compartment |
| Rated Life | 6 months or 200 gallons |
| NSF Certifications | NSF/ANSI 42 (chlorine, taste) and NSF/ANSI 53 (lead, cysts, VOCs) |
| Lead Reduction | Greater than 99% |
| Cyst Reduction | Greater than 99.95% |
| OEM Retail Price | ~$44.99 |
| Compatible Price | $19.95 at SwapMyFilter |
Best LT1000P Filter Options
How to Install the LG LT1000P — Step by Step
Locate the Filter Housing
Open your LG refrigerator. Look in the upper right corner of the refrigerator interior. The LT1000P housing is a circular cavity with the installed filter visible as a protruding cylindrical cartridge.
Switch Off the Ice Maker
Lift the ice maker arm to the off position or press the ice maker off switch inside the freezer. This prevents water demand during the swap.
Remove the Old Filter
Grip the filter body firmly. Rotate counterclockwise approximately a quarter-turn until it releases from the housing. Pull straight out. Have a towel ready — a small drip of water is normal.
💡 If stuck, wrap the filter in a rubber band for grip and apply steady counterclockwise pressure. Never jerk or force.Remove the Protective Cap
Unpack the new LT1000P. Remove the protective plastic cap from the O-ring end before inserting. This is the most common installation mistake — leaving the cap on prevents sealing and causes leaks.
Insert and Lock
Align the filter notch with the housing guide. Push in firmly and rotate clockwise approximately a quarter-turn until you feel a solid locked stop. The filter should sit flush with no wobble.
Flush 2–3 Gallons
Run the dispenser for 4–6 minutes, discarding the water. The first water will appear grey or cloudy — harmless carbon particles from the new filter. Continue until completely clear.
Reset the LG Filter Light
Press and hold the “Water Filter” button on your LG display panel for 3–5 seconds until the indicator changes from red or orange to blue or turns off. Turn the ice maker back on.
LG LT1000P Low Water Flow — Troubleshooting
Slow dispenser flow after installing a new LT1000P is the most common post-installation complaint. Work through these checks in order:
- Confirm the O-ring cap is fully removed — the cap blocks flow completely if left on
- Confirm the filter is fully locked — a partial quarter-turn leaves the internal valve partially closed; remove and reinstall with a firm locked stop
- Flush completely — run 3 full gallons before measuring flow. Carbon particles temporarily restrict flow during the initial flush
- Check home water pressure — LG requires minimum 20 PSI. Check at the supply valve behind the fridge with an inexpensive gauge
- Inspect the supply line — a kinked line behind the fridge is frequently overlooked
A properly installed, fully flushed LT1000P should dispense approximately 8–12 oz in 30 seconds at standard household pressure. If flow is significantly below this after a complete flush and confirmed installation, contact our support team with your LG model number.
What the LT1000P Removes — Contaminant Data
| Contaminant | NSF Standard | Reduction Rate | Health Concern |
|---|---|---|---|
| Chlorine (taste and odour) | NSF 42 | Greater than 97% | Taste, odour, potential long-term exposure |
| Lead | NSF 53 | Greater than 99% | Neurotoxin — harmful at any level |
| Cysts (Cryptosporidium, Giardia) | NSF 53 | Greater than 99.95% | Parasitic waterborne illness |
| Benzene | NSF 53 | Greater than 99% | Known carcinogen |
| Asbestos | NSF 53 | Greater than 99% | Carcinogen when ingested |
| Mercury | NSF 53 | Greater than 96% | Heavy metal toxin |
| Turbidity (sediment) | NSF 53 | Greater than 99% | Aesthetic and pathogen carrier |
According to NSF International, NSF 53 certification for lead is particularly important for homes built before 1986 where lead pipes or lead solder may still be present in the plumbing system. The LT1000P’s greater than 99% lead reduction provides meaningful protection in these situations.
For the complete science on what filters do and don’t remove: What Does a Refrigerator Water Filter Actually Remove?
How Often Should You Replace the LT1000P?
Every 6 months or 200 gallons — whichever comes first. Signs it is overdue: chlorine taste returning, reduced dispenser flow, or the LG filter indicator turning red or orange.
For a personalised replacement schedule based on your household size and usage, use our filter life formula: Days until replacement = 200 ÷ (Number of people × gallons per person per day). A family of four using approximately 0.5 gallons per person daily reaches 200 gallons in around 100 days — about 3.3 months. Adjust upward for light users, downward for heavy households.
OEM vs Compatible LT1000P — The Money Decision
At $44.99 OEM vs $19.95 compatible, you save $25 per filter or $50 annually at the standard two-per-year schedule. Over 5 years, that is $250 in savings — for water that tests identically under NSF/ANSI 53 certification. The US Magnuson-Moss Warranty Act generally prevents LG from voiding your warranty simply for using a certified compatible filter. For full analysis: OEM vs Compatible Refrigerator Water Filters: The Honest Truth.
Confirm your LG model uses the LT1000P
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Check My Model →Frequently Asked Questions About the LG LT1000P
Get Your LG LT1000P Compatible Filter Today
NSF-certified. Guaranteed to fit. $19.95 with same-day shipping. Save over $25 per filter vs LG OEM — for the same verified clean water.
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