Owner’s manual
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How often should an LG water filter be replaced?
For the LG LFX25973ST bottom-mount refrigerator, we replace the refrigerator water filter about every 6 months (or sooner if water flow slows or taste and odor change). This keeps the dispenser and ice maker water quality consistent and helps protect the water system.
Replacement timing guidelines
- Replace every 6 months for normal household use.
- Replace sooner if you notice slow dispensing, cloudy ice, or off taste/odor.
- Replace after a long period of non-use (vacation) if water tastes stale.
- Replace after plumbing work or a new water line hookup that may introduce sediment.
- If your filter indicator is on, replace the filter and then reset the indicator using the steps in the LFX25973ST owner's manual.
Which filter fits this model?
For LFX25973ST, a common replacement is the LG refrigerator water filter ADQ72910911. Always match by model number and the filter part ID to avoid leaks or poor fit.
| Situation | Replace now? | Why |
|---|---|---|
| 6 months of use | Yes | Typical capacity is reached |
| Water dispenses slowly | Yes | Filter media is likely restricted |
| Bad taste or odor | Yes | Filter is no longer reducing contaminants effectively |
| New filter installed | No | Flush water through to clear air and carbon fines |
After you install the new filter
- Dispense and discard several glasses of water to flush the filter.
- Check the filter area for drips for the first few minutes.
- Dump the first bin of ice (or the first few batches) if taste is off.
For step-by-step help, we recommend how to replace the water filter in an LG refrigerator.
Why it matters
A fresh water filter helps maintain water flow to the dispenser, supports reliable ice production, and reduces sediment that can strain components like the water inlet valve and reservoir.
Last updated: February 2026
How do I know which filter for my LG refrigerator?
For LG model LFX25973ST, the most reliable way to confirm the correct filter is to match what’s printed on the existing filter or the filter housing label inside the refrigerator. For this model, the compatible refrigerator water filter we list is LT500P: LG refrigerator water filter ADQ72910911.
Quick ways to identify the right filter
- Check the old filter’s label for an LG filter name (example: LT500P) and/or an LG part number.
- Look at the filter head or housing inside the fresh food section; the filter type is often printed there.
- Compare the shape: quarter-turn twist-in filters are not interchangeable across all LG models.
- If your water flow is slow or tastes off, replace the filter first before troubleshooting the dispenser.
- Use the replacement steps and reset instructions in the LFX25973ST owner’s manual.
What we recommend for LFX25973ST
Here’s the filter information tied to this LG bottom-mount refrigerator model.
| Item | What to look for | What it does |
|---|---|---|
| Water filter | LT500P (our listed filter for this model) | Reduces taste and odor issues; helps protect the water dispenser and ice maker |
Common signs you have the wrong filter
- It will not seat fully or lock into place
- It leaks at the filter head after installation
- The dispenser flow is very weak immediately after replacement
- You cannot clear the “replace filter” light after following the reset steps
Why it matters
Using the correct LG refrigerator water filter helps maintain normal water pressure to the dispenser and supports consistent ice production. A mismatched filter can cause leaks, poor flow, and repeated filter warnings.
Last updated: February 2026
What happens if you don't replace the water filter in an LG refrigerator?
If you do not replace the water filter in your LG LFX25973ST refrigerator, water flow usually slows down and water and ice quality drops because the filter media becomes clogged and less effective. Over time, you can also see more sediment, off-tastes, and dispenser or ice maker performance issues.
What you may notice first
- Slower water dispensing (restricted flow)
- Smaller or hollow ice cubes
- Water that tastes or smells “off”
- Cloudy water or visible particles
- More frequent dispenser dripping after use
Why it can cause dispenser and ice maker problems
A refrigerator water filter is designed to trap sediment and reduce taste and odor issues. As it loads up, it restricts water supply to the dispenser and ice maker. That restriction can look like a “bad ice maker,” but the root cause is often a filter that is overdue.
If you are already seeing low flow, replacing the filter is the fastest first step. For this model, use the correct filter type and follow the reset and flushing steps in the LFX25973ST owner's manual.
Recommended replacement timing (typical)
Most LG refrigerator water filters are replaced about every 6 months, or sooner if you have low water pressure, heavy use, or noticeable taste and odor changes.
| Situation | Replace sooner than 6 months? | Why |
|---|---|---|
| Low dispenser flow | Yes | Filter is likely restricting flow |
| Cloudy water or sediment | Yes | Filter is loaded or water supply has more particles |
| Light use, good flow | Usually no | Filter capacity lasts longer |
After you replace the filter
- Dispense and discard several minutes of water to flush air and carbon fines
- Reset the filter indicator (if your model has one)
- Check for leaks at the filter head and housing
- If flow is still low, inspect the house shutoff valve and supply line
For step-by-step help, we recommend how to replace the water filter in an LG refrigerator. If you need the correct replacement part for this model, match the filter by part ID, such as LG refrigerator water filter ADQ72910911.
Why it matters
A fresh filter helps protect water taste, supports steady water pressure to the dispenser, and helps the ice maker fill properly. Replacing it on schedule is one of the simplest ways to prevent nuisance water and ice issues.
Last updated: February 2026
Are LG water filters worth it?
For the LG LFX25973ST bottom-mount refrigerator, an OEM LG water filter is worth it when you want the best fit, fewer leak issues, and consistent taste and odor reduction. The main tradeoff is cost; replacing on schedule helps protect the dispenser, ice maker, and water valve.
What “worth it” means for LFX25973ST
Using the correct filter helps your refrigerator’s water system seal properly and maintain normal flow. For this model, a common replacement is the LG refrigerator water filter ADQ72910911.
Most customers choose OEM filters for:
- Proper fit in the filter head (less chance of bypassing or dripping)
- More consistent water flow at the dispenser
- Better taste and odor performance over the filter’s service life
- Fewer nuisance issues after installation (air in line, sputtering)
- Simpler replacement and reset steps using the LFX25973ST owner's manual
When an LG filter is the best choice
An OEM filter is the best value when any of these are true:
- You use the ice maker daily and want steady cube production
- Your water has noticeable chlorine taste or odor
- You have had leaks with off-brand filters in the past
- You want the most predictable fit and seal
Cost vs. performance: quick comparison
| Option | Upfront cost | Fit and leak risk | Water flow consistency | Best for |
|---|---|---|---|---|
| OEM LG filter | Higher | Lowest | Most consistent | Most households |
| Off-brand “compatible” | Lower | Varies | Varies | Light use, budget-first |
| No filter/bypass (if applicable) | Lowest | N/A | High | Not recommended for taste/odor |
Why it matters
A restricted or poorly sealing filter can reduce dispenser flow and affect ice maker fill. Staying on a regular replacement schedule also reduces strain on water system components such as the refrigerator water inlet valve AJU73432801.
Last updated: February 2026
