Modern refrigerator with water dispenser — fridge filters don't remove all contaminants

Refrigerator filter vs. reverse osmosis

Your Refrigerator Filter Is a Good Start. It's Not Enough.

Refrigerator filters do some things well. But they're not designed to remove chloramine, PFAS, nitrates, or heavy metals — the contaminants most Columbus homeowners are actually concerned about.

See our alkaline RO system Drinking Water Center

~40%

Of contaminants removed by typical fridge filter

99%

Removed by reverse osmosis

6 mo.

Typical fridge filter replacement interval (often skipped)

What refrigerator filters actually do

Refrigerator filters use activated carbon to reduce chlorine taste and odor, some sediment, and a limited range of contaminants. For many households, they're a meaningful improvement over unfiltered tap water.

The problem is what they're not designed to remove. NSF 42 certification (which most fridge filters carry) only covers taste and odor — not health-related contaminants. NSF 53 covers some health contaminants, but very few fridge filters carry it. NSF 58 (the RO standard) covers the full range.

Columbus water is treated with chloramine — not free chlorine. Chloramine is significantly harder to remove than free chlorine and requires more carbon contact time than a refrigerator filter provides. Most fridge filters reduce chloramine partially at best.

Signs your fridge filter isn't doing enough

You still notice a chlorine or chemical taste

If you can taste chloramine after filtering, your filter isn't removing it effectively. This is common with Columbus water because chloramine requires more carbon contact time than fridge filters provide.

You still buy bottled water even with a fridge filter

If you don't trust your filtered water enough to stop buying bottles, that's a clear sign the filter isn't meeting your needs.

You're concerned about PFAS or lead

Standard refrigerator filters (NSF 42) are not certified to remove PFAS or lead. If these are concerns, you need NSF 58 (RO) filtration.

You have a new baby or are pregnant

Nitrates — which fridge filters don't remove — are a concern for infants. RO is the appropriate solution for households with infants.

Your filter is overdue for replacement

Most fridge filters should be replaced every 6 months. Many households go 12–18 months. An overdue filter can actually release contaminants back into your water.

You want filtered water at every kitchen tap, not just the dispenser

A fridge filter only covers the dispenser and ice maker. An under-sink RO system provides filtered water at a dedicated faucet — and can be connected to the fridge line too.

Refrigerator filter vs. reverse osmosis — what each removes

Contaminant	Fridge filter	Reverse osmosis
Chlorine taste & odor
Chloramine (Columbus uses this) Requires long contact time fridge filters don't provide	Partial
Lead Only NSF 53-certified filters; most fridge filters are NSF 42 only	Some
PFAS / PFOA / PFOS Not removed by standard carbon filters
Nitrates Carbon filtration does not remove nitrates
Arsenic
Total dissolved solids TDS passes through carbon filters unchanged
Microplastics Depends on pore size of specific filter	Partial
Sediment

When a refrigerator filter is probably enough

If your only concern is taste and odor, you're not worried about PFAS or nitrates, you don't have infants in the household, and you consistently replace the filter on schedule — a refrigerator filter may be sufficient. We'll tell you honestly after testing your water.

Frequently asked questions

Can I use both a fridge filter and an RO system?

Yes, and many households do. The RO system handles drinking and cooking water at the kitchen sink. The fridge filter handles the dispenser and ice maker — though you can also connect the RO system to the fridge line for filtered ice.

What NSF certification should I look for in a fridge filter?

NSF 42 covers taste and odor only. NSF 53 adds some health contaminants including lead. Very few refrigerator filters carry NSF 53. If health contaminants are your concern, an NSF 58-certified RO system is the appropriate solution.

How do I know if my fridge filter is actually working?

The honest answer is that you often can't tell without testing. A TDS meter can show you whether dissolved solids are being reduced, but it won't tell you about specific contaminants. A professional water test before and after filtration gives you real data.

Is an RO system more expensive than a fridge filter?

The upfront cost is higher — our system installs for $895 vs. $30–$60 for a fridge filter. But the annual cost is comparable ($50–$80/year for RO filter replacements vs. $60–$120/year for fridge filter replacements), and the RO system removes far more contaminants.

Does an RO system replace my refrigerator filter?

You can connect the RO system to your refrigerator water line, which would make the fridge filter redundant. Many homeowners do this to get consistent filtered water for both drinking and ice.

Find out what your fridge filter is missing.

A free in-home water test measures your TDS, chloramine, pH, and hardness — and shows you exactly what your current filter is and isn't removing.

Schedule a free water test Call (614) 476-8711

Free · No obligation · Central Ohio homeowners