Home Water Filter Guide: Pitcher, Under-Sink & RO
Key takeaways
- Pitcher and faucet filters are cheap and easy but have low capacity.
- Under-sink filters give high flow and long cartridge life for a whole kitchen.
- Reverse osmosis (RO) removes the widest range of contaminants, including dissolved solids.
- Always match the filter to what you want to remove, and change cartridges on schedule.
Pitcher & faucet filters
The lowest-cost entry point. Pitcher filters and faucet-mount units mainly improve taste and odour by reducing chlorine and some sediment. They're great for renters and small households but have small capacity and need frequent cartridge changes.
Under-sink filters
An under-sink system plumbs into your cold line and delivers filtered water through the main or a dedicated faucet. Cartridges are larger, so flow is strong and replacement intervals are long (often 6–12 months). A solid choice for a whole kitchen without countertop clutter.
Reverse osmosis (RO)
RO pushes water through a semi-permeable membrane to strip out the widest range of contaminants — dissolved solids, lead, fluoride, nitrates and more. Systems include pre- and post-filters and usually a storage tank. RO gives the purest water; the trade-offs are slower production and some water sent to drain.
How to choose
- Decide what you want to remove (taste/chlorine vs lead vs dissolved solids) — this drives the type.
- Check the cartridge life and replacement cost, not just the upfront price.
- Match flow rate to your household size.
- Keep a schedule: a filter past its life can do more harm than good.
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Frequently asked questions
What's the difference between a carbon filter and reverse osmosis?
A carbon filter mainly reduces chlorine, taste and odour. Reverse osmosis removes a far wider range, including dissolved solids, lead and nitrates, by forcing water through a membrane.
How often should I change a water filter cartridge?
It depends on the type and your water use: pitcher/faucet filters monthly to every few months, under-sink every 6–12 months, RO membranes every 2–3 years. Follow the cartridge's rating.
Do I need reverse osmosis?
Only if you want to remove dissolved solids and a broad range of contaminants. For taste and chlorine alone, a carbon under-sink or faucet filter is enough.
Product information is for general reference only. Specifications, finishes and compatibility can vary — always check the manufacturer’s listing and instructions. For electrical, plumbing, gas or structural work, follow your local building and electrical codes and use a licensed professional where required.