Fazlur Rahman
At a glance
- DIY salt-based install runs $300-$700; professional single-unit install $600-$1,200.
- Whole-house filtration is $1,400-$2,800 installed. Point-of-use reverse osmosis is $350-$900.
- Size on grains per gallon x daily usage. A family of four at 8 gpg needs about a 1,000 gpd unit.
- Annual running cost is roughly $200-$300, mostly salt, and far less than most buyers expect.
- The unit is 40-60% of the bill. Bypass, drain line, and a permit where required make up the rest.
Prices last verified October 2026. Plumbing rates and unit pricing vary by region — confirm current pricing before you buy.
The three system types, and what each one actually solves
These get sold interchangeably and they are not interchangeable. An ion-exchange softener swaps calcium and magnesium for sodium and does nothing about chlorine, sediment, or lead. A whole-house filter addresses sediment, chlorine, or oxidised iron but leaves hardness untouched. A reverse osmosis unit strips a very wide list of contaminants but is a point-of-use installation with a limited flow rate and a waste stream.
Most households with hard municipal water need exactly one softener and nothing else. Households on a well with iron and sediment need filtration plus, usually, a softener. Households worried about lead or fluoride want a certified point-of-use filter at the kitchen tap.
| System | What it removes | What it does not remove | Installed cost (2026) | Annual running cost | Capacity limits |
|---|---|---|---|---|---|
| Ion-exchange softener | Calcium, magnesium (hardness) | Chlorine, sediment, iron, lead | $300-$700 DIY / $600-$1,200 pro | $200-$300 (salt, power) | Regenerates every 3-7 days; interrupts flow |
| Carbon whole-house filter | Chlorine, taste, odour, some sediment | Hardness, most heavy metals | $900-$1,600 pro | $40-$90 (cartridge) | 10,000-50,000 gallon life |
| Iron filter | Oxidised iron, manganese | Hardness, sediment | $1,100-$2,200 pro | $60-$120 (media) | Needs air injection or chemical tank |
| Whole-house reverse osmosis | Very broad list including hardness and heavy metals | Nothing, but flow is limited | $2,500-$5,500 pro | $180-$400 (filter changes) | Low flow; typically 8-15 gal/min at half |
| Point-of-use reverse osmosis | Lead, fluoride, chlorine, dissolved solids | Anything upstream of the tap it serves | $350-$900 pro | $90-$180 (filters, 1-2 yr) | 15-25 gal/day; needs a drain line |
| Lead-reducing filter (NSF 53) | Lead and other heavy metals | Hardness, sediment | $400-$1,200 pro | $70-$150 (cartridge) | Must be NSF 53 certified to count |
Where the money actually goes on an install
The softener unit is usually 40-60% of a self-install and a smaller share of a professional install, because labour is the expensive part. Beyond the unit, the recurring line items are the bypass valve, the drain line, and the brine tank — and the brine tank is the one people forget to budget for.
