Your LG refrigerator delivers clean, great-tasting water every day but only when the right filter is installed and replaced on schedule. If you are looking at the part number LT1000P and are not completely sure it is the correct replacement for your unit, this guide will walk you through exactly how to check compatibility before buying so you can order with confidence and avoid a costly mismatch.
Why LG Refrigerator Water Filter Codes Can Be Confusing
LG produces refrigerators across multiple series and generations and different configurations use different water filter formats. Here is why buyers frequently run into confusion when searching for the right replacement:
- The LT1000P and LT800P are the most commonly confused filter codes because they cover consecutive LG refrigerator generations, share the same certification level and service life, and both use twist-in designs that look nearly identical
- Alternative part numbers like ADQ747935 and MDJ64844601 appear in listings alongside LT1000P making it unclear which code is the primary replacement for a specific refrigerator model
- All LG water filter codes use twist-in designs so buyers cannot tell filters apart by installation type alone and must confirm by part number
- LG refrigerator model numbers change frequently across series and buyers who recently upgraded from an older LG model may assume their new refrigerator uses the same filter code as their previous one
- The LT120F air filter follows a similar LT naming convention leading some buyers to confuse air filter and water filter part numbers when ordering replacements for both at the same time
Where to Find Your LG Refrigerator Filter Part Number Before Buying
- Check the label on your current filter — the part number is printed directly on it. This is the fastest and most reliable confirmation
- Look inside the filter housing slot — some LG models print the required filter code on a label inside the housing slot itself, typically in the upper right corner of the fresh food compartment
- Find the model plate inside the fridge — typically located along the upper door frame or side wall of the fresh food compartment. Use the model number to cross-reference the correct filter code
- Check your user guide — the maintenance section lists the exact replacement filter code for your specific LG refrigerator model
- Search by model number on the retailer page — if the label is worn or unreadable this is the quickest way to confirm the right filter before you buy
What Is the LG LT1000P Water Filter?
The LG LT1000P is an NSF 42 and 53 certified replacement water filter designed for newer generation LG French door and side-by-side refrigerator models. It uses activated carbon block filtration to reduce chlorine taste and odor, lead, heavy metals, and VOCs before water reaches the dispenser or ice maker. The LT1000P has a service life of 200 gallons or 6 months whichever comes first and uses a twist-in installation design that requires no tools. Alternative part numbers ADQ747935 and MDJ64844601 refer to the same LT1000P filter format.
What Is the LG LT800P Water Filter?
The LG LT800P is also an NSF 42 and 53 certified activated carbon block replacement water filter but is designed for an earlier generation of LG French door and side-by-side refrigerator models. It carries the same service life as the LT1000P and uses the same twist-in installation design, but the housing tolerances are specific to LT800P compatible models and are not interchangeable with the LT1000P. If your existing filter shows LT800P, ADQ73613401, ADQ73613402, or MDJ64844601, the LT800P is the correct replacement for your unit and not the LT1000P.
Is the LG LT1000P the Same as the LT800P?
No. This is the single most common question buyers ask when searching for an LG refrigerator water filter replacement. While the LT1000P and LT800P are both NSF 42 and 53 certified activated carbon block filters with the same service life and the same twist-in installation design, they are separate part numbers with different housing tolerances built for different LG refrigerator model generations. Ordering the LT1000P for a refrigerator that requires the LT800P will result in a filter that either does not seat properly or leaves gaps at the housing connection that allow unfiltered water to bypass the filter entirely. Always confirm the part number on the existing filter before placing your order.
Compatibility Checklist Before You Buy the LG LT1000P
- Your current filter label shows LT1000P, ADQ747935 — the LT1000P is the confirmed replacement for your unit
- Your refrigerator model appears on the LT1000P compatibility list — cross-check your model number before ordering
- Your refrigerator is a newer generation LG French door or side-by-side model — the LT1000P covers select configurations within these series
- Your current filter does not show LT800P or any LT800P alternative codes — if it does the LT800P is the correct replacement not the LT1000P
- Your current filter uses a twist-in connection — the LT1000P is twist-in only
- It has been 6 months or 200 gallons since your last replacement — if yes it is time to order regardless of how the water currently tastes or flows
Common Mistakes When Buying the LG LT1000P Water Filter
- Ordering the LT1000P because it is the most commonly listed LG filter — the LT1000P covers newer LG models only. Refrigerators that require the LT800P or LT700P will not accept the LT1000P even if they appear to be relatively recent models
- Assuming ADQ747935 and the LT1000P are different filters — they are not. ADQ747935 is an alternative part number for the same LT1000P filter. If your label shows this code the LT1000P is the correct replacement to order
- Confusing the LT1000P water filter with the LT120F air filter — both follow the LT naming convention but serve completely different functions. The LT120F is an air filter for the refrigerator compartment while the LT1000P filters dispensed water and ice
- Ordering based on appearance rather than part number — the LT1000P and LT800P look nearly identical but have different housing tolerances that prevent cross-code substitution
- Skipping the post-installation flush — always run 2 to 3 gallons through the dispenser after installing a new LT1000P to clear carbon fines before drinking
- Forgetting to reset the filter indicator — an unreset indicator will trigger a false early replacement reminder even when the new filter is performing correctly. Reset the indicator per the LG user guide immediately after installation
When Should You Order a Replacement LG LT1000P Filter?
- 6 months have passed since the last replacement — the primary trigger regardless of gallon count or water quality
- 200 gallons have passed — replace at this threshold if your household reaches it before the 6 month mark
- Water tastes flat or slightly chemical — the carbon block is no longer reducing chlorine and contaminants at full capacity
- Ice has a chlorine or off taste — a reliable sign the filter is past its effective odor and contaminant reduction life
- Water flow from the dispenser has slowed noticeably — a saturated filter restricts flow through the housing
- The filter indicator light has activated — order a replacement promptly rather than waiting for additional signs of reduced performance
Ready to Order the LG LT1000P Refrigerator Water Filter?
If your LG refrigerator uses the LT1000P water filter you can view the compatible replacement and confirm availability here. Ordering the correct filter and replacing on schedule ensures your refrigerator delivers consistently clean, great-tasting water and ice through every cycle.
Shop LG LT1000P Refrigerator Water Filter from purefridgewater.
FAQs
How do I know if my LG refrigerator needs the LT1000P and not the LT800P?
Check the part number on the existing filter currently installed in your refrigerator. If it shows LT1000P or ADQ747935, the LT1000P is the confirmed replacement. If it shows LT800P, ADQ73613401, ADQ73613402, or MDJ64844601, the LT800P is the correct replacement for your unit.
Can I use the LT800P instead of the LT1000P if they look the same?
No. Despite sharing the same certifications, service life, and twist-in installation design, the LT1000P and LT800P have different housing tolerances and are not interchangeable. Using the wrong filter risks an improper seal that allows unfiltered water to bypass the filter at the housing connection.
Do I need to turn off the water supply before replacing the LT1000P?
The twist-in housing on the LT1000P is designed for a straightforward swap on most compatible LG models without requiring the water supply to be shut off. Some minor dripping at the housing during the swap is normal. Consult the LG user guide for your specific model if you are unsure.
Is the LG LT1000P available in a multipack for households that replace filters frequently?
Check the product listing on the shop page for multipack options. Buying in a multipack is a practical option for households that replace the filter at or before the 6 month mark and want to keep a spare on hand to avoid any gap in filtration performance.
Why does my water still taste off after installing a new LT1000P filter?
Running 2 to 3 gallons through the dispenser after installation flushes carbon fines and trapped air from the new filter and typically resolves any residual taste issues. If off taste persists beyond the flush cycle, confirm the filter is fully locked into the housing and that the filter indicator has been reset.
Where can I find more detail on how the LT1000P compares to the LT800P before I buy?
The LG LT1000P landing page includes a full head to head comparison table covering the LT1000P and LT800P side by side including compatible model generations, housing design differences, and service life to help you confirm the correct filter before ordering.