MF370 vs EDR1RXD1: Best Replacement Water Filter Guide

Why Replace Your Mountain Flow MF370 Filter?

Your refrigerator water filter is your last line of defense against contaminants hiding in your tap water. The Mountain Flow MF370 is a popular aftermarket replacement filter; but like all filters, it has a lifespan. Most manufacturers recommend replacing your fridge filter every 6 months or 200 gallons, whichever comes first.

Here's why timely replacement matters:

If you're already due for a replacement, this is the perfect time to evaluate whether sticking with the MF370 or upgrading to the EveryDrop EDR1RXD1 makes more sense for your household.

MF370 vs EveryDrop EDR1RXD1

Both filters are designed to fit the same refrigerator models, but they differ significantly in filtration performance, certifications, and brand backing. Here's a detailed side-by-side breakdown:

Quick Comparison Table

NSF Certification: What It Means for You

NSF International is an independent organization that tests and certifies water filters. The certifications tell you exactly what a filter is proven to remove:

• NSF 42: Aesthetic contaminants — chlorine, taste, odor, and particulates.
• NSF 53: Health-related contaminants — lead, cysts (Cryptosporidium, Giardia), VOCs, and more.
• NSF 401: Emerging contaminants — pharmaceuticals, pesticides, herbicides, and other trace chemicals.

The MF370 carries NSF 42 certification only, meaning it's tested for taste and odor improvement. The EDR1RXD1 holds NSF 42, 53, and 401 — a significantly broader scope of protection, especially for households concerned about lead or pharmaceutical residues in their water.

Compatibility: Which Fridges Do They Fit?

Both filters are designed for the same filter slot (Filter 1 position), but the EDR1RXD1 has broader official compatibility. Common compatible refrigerator brands include:

• Whirlpool
• Maytag
• KitchenAid
• Amana
• JennAir

Read More: EDR1RXD1 Compatible Models

Always verify your refrigerator's model number before purchasing. You can find it on the label inside the fridge door or in your owner's manual.

What Contaminants Do These Filters Remove?

Understanding what's actually in your water — and what each filter removes — is critical for making the right choice.

What the MF370 Removes

As an NSF 42-certified filter, the Mountain Flow MF370 is effective at reducing:

• Chlorine taste and odor
• Sediment and particulates (Class I)
• Some dissolved solids affecting water clarity

It's a solid choice if your primary concern is improving the taste and smell of your water and your local water supply is already treated and relatively clean.

What the EDR1RXD1 Removes

The EveryDrop EDR1RXD1 goes significantly further, with NSF 53 and 401 certifications covering:

• Lead — a serious health concern in older homes with aging pipes
• Cysts — Cryptosporidium and Giardia, which can cause gastrointestinal illness
• Asbestos
• Benzene and VOCs (volatile organic compounds)
• Pharmaceuticals — including trace amounts of ibuprofen, progesterone, and other drugs
• Pesticides and herbicides
• Mercury
• Chlorine, taste, odor, and sediment (same as MF370)

In total, the EDR1RXD1 is tested to reduce over 200 contaminants — making it one of the most comprehensive refrigerator water filters available.

Does a Fridge Filter Remove Lead?

The MF370 does not have NSF 53 certification, so it is not tested or certified to remove lead. If lead is a concern in your home — especially in houses built before 1986 — the EDR1RXD1 is the safer choice, as it is NSF 53 certified for lead reduction.

Is Refrigerator Water Safe to Drink?

Filtered refrigerator water is generally safe to drink, but the level of safety depends on the quality of your filter. A basic NSF 42 filter like the MF370 improves taste but doesn't address health-related contaminants. An NSF 53+ filter like the EDR1RXD1 provides a higher level of protection. For households with young children, pregnant women, or immunocompromised individuals, upgrading to a higher-certified filter is strongly recommended.

How to Replace Your Refrigerator Water Filter

Replacing your fridge water filter is a simple process that takes less than 5 minutes. Here's a step-by-step guide:

Step 1: Locate Your Filter

The Filter 1 position (used by both MF370 and EDR1RXD1) is typically located in the upper-right corner inside the refrigerator. Some models have it in the base grille at the bottom front.

Step 2: Remove the Old Filter

Turn the old filter counterclockwise (about a quarter turn) and pull it straight out. Have a small towel ready — a little water may drip out.

Step 3: Install the New Filter

Remove the protective cap from your new filter. Insert it into the slot and turn clockwise until it locks into place. You'll feel or hear a click when it's seated correctly.

Step 4: Flush the Filter

Run approximately 2–3 gallons of water through the dispenser before drinking. This flushes out any carbon fines (harmless black particles) from the new filter and primes it for use.

Step 5: Reset the Filter Indicator

Reset your refrigerator's filter change indicator light. Refer to your owner's manual — most models require holding the "Filter Reset" or "Water Filter" button for 3 seconds.

Common Problems (Bad Taste, Low Pressure, Smell)

Even after installing a new filter, some users experience issues. Here's how to troubleshoot the most common problems:

Bad Taste After Filter Change

If your water still tastes off after installing a new filter, the most likely cause is insufficient flushing. Run an additional 1–2 gallons through the dispenser. If the problem persists, verify the filter is properly seated and locked in place.

Low Water Pressure or Slow Dispensing

Low pressure after a filter change can indicate:

• The filter isn't fully locked in (try removing and reinstalling)
• Air trapped in the water line (continue flushing)
• A kinked water supply line behind the fridge
• Low household water pressure (below 20 PSI)

Musty or Chlorine Smell

A musty smell often means the old filter was left in too long and developed bacterial growth. A chlorine smell after installation is normal and will dissipate after flushing. If the smell persists beyond 2–3 gallons of flushing, the filter may be defective — contact the retailer for a replacement.

Filter Indicator Light Won't Reset

Each refrigerator brand has a slightly different reset process. For most Whirlpool and Maytag models, press and hold the "Filter" button for 3 seconds. Consult your owner's manual if this doesn't work.

Why Upgrade to EveryDrop Filter 1?

The EveryDrop EDR1RXD1 (also marketed as EveryDrop Filter 1) is the OEM (original equipment manufacturer) filter made by Whirlpool — the same company that makes many of the refrigerators these filters are designed for. Here's why upgrading makes sense:

Superior Contaminant Reduction

As detailed above, the EDR1RXD1's NSF 42 + 53 + 401 triple certification means it removes a dramatically wider range of contaminants than the MF370. If you're serious about water quality, this is the most important reason to upgrade.

OEM Fit and Reliability

Because the EDR1RXD1 is made by Whirlpool, it's engineered to exact specifications for compatible refrigerators. This means a more reliable seal, consistent water flow, and reduced risk of leaks compared to aftermarket alternatives.

Peace of Mind

Knowing your filter is certified to remove lead, cysts, and pharmaceuticals — not just chlorine — provides a level of confidence that an NSF 42-only filter simply can't match. For families with young children or health-conscious households, this peace of mind is invaluable.

Backed by Whirlpool's Warranty

Using an OEM filter like the EDR1RXD1 ensures you remain compliant with your refrigerator's warranty terms. Some manufacturers void warranty claims related to water damage if a non-OEM filter was in use at the time of the issue.

Can I Replace MF370 with EDR1RXD1?

Yes — the EDR1RXD1 is a direct drop-in replacement for the MF370 in compatible refrigerators. Both filters use the same Filter 1 slot and installation process. Simply remove your MF370 and install the EDR1RXD1 following the steps outlined above. No tools or modifications are required.

Always double-check your refrigerator's model number against the EDR1RXD1 compatibility list before purchasing to ensure a proper fit.

Final Verdict: Is EDR1RXD1 Worth It?

If you're currently using the Mountain Flow MF370 and it's time for a replacement, upgrading to the EveryDrop EDR1RXD1 is absolutely worth it for most households.

Choose the MF370 if:

• You're on a tight budget and your primary concern is taste and odor
• Your local water supply is well-treated and tested clean for health contaminants
• You've had no issues with your current MF370 performance

Choose the EDR1RXD1 if:

• You want NSF 53 and 401 protection against lead, cysts, and pharmaceuticals
• You have young children, are pregnant, or have immunocompromised family members
• You live in an older home with aging pipes (lead risk)
• You want the reliability and warranty compliance of an OEM filter
• You want the most comprehensive filtration available for your refrigerator

Buy Mountain Flow MF370 Replacement Water Filter

The EDR1RXD1 costs more than the MF370, but the difference in filtration performance — especially the addition of NSF 53 lead reduction — makes it a worthwhile investment for most families. Clean, safe drinking water is one area where cutting corners rarely pays off.

Bottom Line

The EveryDrop EDR1RXD1 is the superior filter in virtually every measurable category: more certifications, broader contaminant removal, OEM reliability, and greater peace of mind. If you're replacing your MF370 today, make the upgrade — your family's health is worth it.